/* =================================================================================================
 * TransMenu
 * March, 2003
 *
 * Customizable multi-level animated DHTML menus with transparency.
 *
 * Copyright 2003-2004, Aaron Boodman (www.youngpup.net)
 * ================================================================================================= */

//==================================================================================================
// Configuration properties
//==================================================================================================
TransMenu.spacerGif = "/images/menu/x.gif";                     // path to a transparent spacer gif
TransMenu.dingbatOn = "/images/menu/submenu-on.gif";            // path to the active sub menu dingbat
TransMenu.dingbatOff = "/images/menu/submenu-off.gif";          // path to the inactive sub menu dingbat
TransMenu.dingbatSize = 14;                            // size of the dingbat (square shape assumed)
TransMenu.menuPadding = 1;                             // padding between menu border and items grid
TransMenu.itemPadding = 3;                             // additional padding around each item
TransMenu.shadowSize = 2;                              // size of shadow under menu
TransMenu.shadowOffset = 2;                            // distance shadow should be offset from leading edge
TransMenu.shadowColor = "#395F86";                        // color of shadow (transparency is set in CSS)
TransMenu.shadowPng = "/images/menu/grey-40.png";               // a PNG graphic to serve as the shadow for mac IE5
TransMenu.backgroundColor = "white";                   // color of the background (transparency set in CSS)
TransMenu.backgroundPng = "/images/menu/white-90.png";          // a PNG graphic to server as the background for mac IE5
TransMenu.hideDelay = 400;                            // number of milliseconds to wait before hiding a menu
TransMenu.slideTime = 120;                             // number of milliseconds it takes to open and close a menu


//==================================================================================================
// Internal use properties
//==================================================================================================
TransMenu.reference = {topLeft:1,topRight:2,bottomLeft:3,bottomRight:4};
TransMenu.direction = {down:1,right:2};
TransMenu.registry = [];
TransMenu._maxZ = 100;


//==================================================================================================
// Static methods
//==================================================================================================
// supporting win ie5+, mac ie5.1+ and gecko >= mozilla 1.0
TransMenu.isSupported = function() {
   var ua = navigator.userAgent.toLowerCase();
   var pf = navigator.platform.toLowerCase();
   var an = navigator.appName;
   var r = false;

   if (ua.indexOf("gecko") > -1 && navigator.productSub >= 20020605) r = true; // gecko >= moz 1.0
   else if (an == "Microsoft Internet Explorer") {
      if (document.getElementById) { // ie5.1+ mac,win
         if (pf.indexOf("mac") == 0) {
             r = /msie (\d(.\d*)?)/.test(ua) && Number(RegExp.$1) >= 5.1;
         }
         else r = true;
      }
   }

   return r;
}

// call this in onload once menus have been created
TransMenu.initialize = function() {
   for (var i = 0, menu = null; menu = this.registry[i]; i++) {
      menu.initialize();
   }
}

// call this in document body to write out menu html
TransMenu.renderAll = function() {
   var aMenuHtml = [];
   for (var i = 0, menu = null; menu = this.registry[i]; i++) {
      aMenuHtml[i] = menu.toString();
   }
   document.write(aMenuHtml.join(""));
}

//==================================================================================================
// TransMenu constructor (only called internally)
//==================================================================================================
// oActuator            : The thing that causes the menu to be shown when it is mousedover. Either a
//                        reference to an HTML element, or a TransMenuItem from an existing menu.
// iDirection           : The direction to slide out. One of TransMenu.direction.
// iLeft                : Left pixel offset of menu from actuator
// iTop                 : Top pixel offset of menu from actuator
// iReferencePoint      : Corner of actuator to measure from. One of TransMenu.referencePoint.
// parentMenuSet        : Menuset this menu will be added to.
//==================================================================================================
function TransMenu(oActuator, iDirection, iLeft, iTop, iReferencePoint, parentMenuSet) {
   // public methods
   this.addItem = addItem;
   this.addMenu = addMenu;
   this.toString = toString;
   this.initialize = initialize;
   this.isOpen = false;
   this.show = show;
   this.hide = hide;
   this.items = [];

   // events
   this.onactivate = new Function();       // when the menu starts to slide open
   this.ondeactivate = new Function();     // when the menu finishes sliding closed
   this.onmouseover = new Function();      // when the menu has been moused over
   this.onqueue = new Function();          // hack .. when the menu sets a timer to be closed a little while in the future
   this.ondequeue = new Function();

   // initialization
   this.index = TransMenu.registry.length;
   TransMenu.registry[this.index] = this;

   var id = "TransMenu" + this.index;
   var contentHeight = null;
   var contentWidth = null;
   var childMenuSet = null;
   var animating = false;
   var childMenus = [];
   var slideAccel = -1;
   var elmCache = null;
   var ready = false;
   var _this = this;
   var a = null;

   var pos = iDirection == TransMenu.direction.down ? "top" : "left";
   var dim = null;

   // private and public method implimentations
   function addItem(sText, sUrl) {
      var item = new TransMenuItem(sText, sUrl, this);
      item._index = this.items.length;
      this.items[item._index] = item;
   }

   function addMenu(oMenuItem) {
      if (!oMenuItem.parentMenu == this) throw new Error("Cannot add a menu here");

      if (childMenuSet == null) childMenuSet = new TransMenuSet(TransMenu.direction.right, -5, 2, TransMenu.reference.topRight);

      var m = childMenuSet.addMenu(oMenuItem);

      childMenus[oMenuItem._index] = m;
      m.onmouseover = child_mouseover;
      m.ondeactivate = child_deactivate;
      m.onqueue = child_queue;
      m.ondequeue = child_dequeue;

      return m;
   }

   function initialize() {
      initCache();
      initEvents();
      initSize();
      ready = true;
   }

   function show() {
      //dbg_dump("show");
      if (ready) {
         _this.isOpen = true;
         animating = true;
         setContainerPos();
         elmCache["clip"].style.visibility = "visible";
         elmCache["clip"].style.zIndex = TransMenu._maxZ++;
         //dbg_dump("maxZ: " + TransMenu._maxZ);
         slideStart();
         _this.onactivate();

         //hide moving quote fields when menu is shown
         if (typeof hideElements != "undefined") hideElements();
      }
   }

   function hide() {
      if (ready) {
         _this.isOpen = false;
         animating = true;

         for (var i = 0, item = null; item = elmCache.item[i]; i++)
            dehighlight(item);

         if (childMenuSet) childMenuSet.hide();

         slideStart();
         _this.ondeactivate();

         //show moving quote fields when menu is hidden
         if (typeof showElements != "undefined") showElements();
      }
   }

   function setContainerPos() {
      var sub = oActuator.constructor == TransMenuItem;
      var act = sub ? oActuator.parentMenu.elmCache["item"][oActuator._index] : oActuator;
      var el = act;

      var x = 0;
      var y = 0;

      var minX = 0;
      var maxX = (window.innerWidth ? window.innerWidth : document.body.clientWidth) - parseInt(elmCache["clip"].style.width);
      var minY = 0;
      var maxY = 10000;
      //var maxY = (window.innerHeight ? window.innerHeight : document.body.clientHeight) - parseInt(elmCache["clip"].style.height);

      // add up all offsets... subtract any scroll offset
      while (sub ? el.parentNode.className.indexOf("transMenu") == -1 : el.offsetParent) {
         x += el.offsetLeft;
         y += el.offsetTop;

         if (el.scrollLeft) x -= el.scrollLeft;
         if (el.scrollTop) y -= el.scrollTop;

         el = el.offsetParent;
      }

      if (oActuator.constructor == TransMenuItem) {
         x += parseInt(el.parentNode.style.left);
         y += parseInt(el.parentNode.style.top);
      }

      switch (iReferencePoint) {
         case TransMenu.reference.topLeft:
                 break;
         case TransMenu.reference.topRight:
                 x += act.offsetWidth;
                 break;
         case TransMenu.reference.bottomLeft:
                 y += act.offsetHeight;
                 break;
         case TransMenu.reference.bottomRight:
                 x += act.offsetWidth;
                 y += act.offsetHeight;
                 break;
      }

      x += iLeft;
      y += iTop;

      x = Math.max(Math.min(x, maxX), minX);
      y = Math.max(Math.min(y, maxY), minY);

      elmCache["clip"].style.left = x + "px";
      elmCache["clip"].style.top = y + "px";
   }

   function slideStart() {
      var x0 = parseInt(elmCache["content"].style[pos]);
      var x1 = _this.isOpen ? 0 : -dim;

      if (a != null) a.stop();
      a = new Accelimation(x0, x1, TransMenu.slideTime, slideAccel);

      a.onframe = slideFrame;
      a.onend = slideEnd;

      a.start();
   }

   function slideFrame(x) {
      elmCache["content"].style[pos] = x + "px";
   }

   function slideEnd() {
      if (!_this.isOpen) elmCache["clip"].style.visibility = "hidden";
      animating = false;
   }

   function initSize() {
      // everything is based off the size of the items table...
      var ow = elmCache["items"].offsetWidth;
      var oh = elmCache["items"].offsetHeight;
      var ua = navigator.userAgent.toLowerCase();

      // clipping container should be ow/oh + the size of the shadow
      elmCache["clip"].style.width = ow + TransMenu.shadowSize +  2 + "px";
      elmCache["clip"].style.height = oh + TransMenu.shadowSize + 2 + "px";

      // same with content...
      elmCache["content"].style.width = ow + TransMenu.shadowSize + "px";
      elmCache["content"].style.height = oh + TransMenu.shadowSize + "px";

      contentHeight = oh + TransMenu.shadowSize;
      contentWidth = ow + TransMenu.shadowSize;

      dim = iDirection == TransMenu.direction.down ? contentHeight : contentWidth;

      // set initially closed
      elmCache["content"].style[pos] = -dim - TransMenu.shadowSize + "px";
      elmCache["clip"].style.visibility = "hidden";

      // if *not* mac/ie 5
      if (ua.indexOf("mac") == -1 || ua.indexOf("gecko") > -1) {
         // set background div to offset size
         elmCache["background"].style.width = ow + "px";
         elmCache["background"].style.height = oh + "px";
         elmCache["background"].style.backgroundColor = TransMenu.backgroundColor;
         if (ow == 0) {
      	    ow = (ow + 20)
      	 }
         // shadow left starts at offset left and is offsetHeight pixels high
         elmCache["shadowRight"].style.left = ow + "px";
         elmCache["shadowRight"].style.height = oh - (TransMenu.shadowOffset - TransMenu.shadowSize) + "px";
         elmCache["shadowRight"].style.backgroundColor = TransMenu.shadowColor;

         // shadow bottom starts at offset height and is offsetWidth - shadowOffset
         // pixels wide (we don't want the bottom and right shadows to overlap or we
         // get an extra bright bottom-right corner)
         elmCache["shadowBottom"].style.top = oh + "px";
         elmCache["shadowBottom"].style.width = ow - TransMenu.shadowOffset + "px";
         elmCache["shadowBottom"].style.backgroundColor = TransMenu.shadowColor;
      }
      // mac ie is a little different because we use a PNG for the transparency
      else {
         // set background div to offset size
         elmCache["background"].firstChild.src = TransMenu.backgroundPng;
         elmCache["background"].firstChild.width = ow;
         elmCache["background"].firstChild.height = oh;

         // shadow left starts at offset left and is offsetHeight pixels high
         elmCache["shadowRight"].firstChild.src = TransMenu.shadowPng;
         elmCache["shadowRight"].style.left = ow + "px";
         elmCache["shadowRight"].firstChild.width = TransMenu.shadowSize;
         elmCache["shadowRight"].firstChild.height = oh - (TransMenu.shadowOffset - TransMenu.shadowSize);

         // shadow bottom starts at offset height and is offsetWidth - shadowOffset
         // pixels wide (we don't want the bottom and right shadows to overlap or we
         // get an extra bright bottom-right corner)
         elmCache["shadowBottom"].firstChild.src = TransMenu.shadowPng;
         elmCache["shadowBottom"].style.top = oh + "px";
         elmCache["shadowBottom"].firstChild.height = TransMenu.shadowSize;
         elmCache["shadowBottom"].firstChild.width = ow - TransMenu.shadowOffset;
      }
   }

   function initCache() {
      var menu = document.getElementById(id);
      var all = menu.all ? menu.all : menu.getElementsByTagName("*"); // IE/win doesn't support * syntax, but does have the document.all thing

      elmCache = {};
      elmCache["clip"] = menu;
      elmCache["item"] = [];

      for (var i = 0, elm = null; elm = all[i]; i++) {
         switch (elm.className) {
            case "items":
            case "content":
            case "background":
            case "shadowRight":
            case "shadowBottom":
                elmCache[elm.className] = elm;
                break;
            case "item":
                elm._index = elmCache["item"].length;
                elmCache["item"][elm._index] = elm;
                break;
         }
      }

      // hack!
      _this.elmCache = elmCache;
   }

   function initEvents() {
      // hook item mouseover
      for (var i = 0, item = null; item = elmCache.item[i]; i++) {
         item.onmouseover = item_mouseover;
         item.onmouseout = item_mouseout;
         item.onclick = item_click;
      }

      // hook actuation
      if (typeof oActuator.tagName != "undefined") {
         oActuator.onmouseover = actuator_mouseover;
         oActuator.onmouseout = actuator_mouseout;
      }

      // hook menu mouseover
      elmCache["content"].onmouseover = content_mouseover;
      elmCache["content"].onmouseout = content_mouseout;
   }

   function highlight(oRow) {
      oRow.className = "item hover";
      if (childMenus[oRow._index])
         oRow.lastChild.firstChild.src = TransMenu.dingbatOn;
   }

   function dehighlight(oRow) {
      oRow.className = "item";
      if (childMenus[oRow._index])
         oRow.lastChild.firstChild.src = TransMenu.dingbatOff;
   }

   function item_mouseover() {
      if (!animating) {
         highlight(this);

         if (childMenus[this._index])
            childMenuSet.showMenu(childMenus[this._index]);
         else if (childMenuSet) childMenuSet.hide();
      }
   }

   function item_mouseout() {
      if (!animating) {
         if (childMenus[this._index])
            childMenuSet.hideMenu(childMenus[this._index]);
         else    // otherwise child_deactivate will do this
            dehighlight(this);
      }
   }

   function item_click() {
      if (!animating) {
         if (_this.items[this._index].url)
            location.href = _this.items[this._index].url;
      }
   }

   function actuator_mouseover() {
      parentMenuSet.showMenu(_this);
   }

   function actuator_mouseout() {
      parentMenuSet.hideMenu(_this);
   }

   function content_mouseover() {
      if (!animating) {
         parentMenuSet.showMenu(_this);
         _this.onmouseover();
      }
   }

   function content_mouseout() {
      if (!animating) {
         parentMenuSet.hideMenu(_this);
      }
   }

   function child_mouseover() {
      if (!animating) {
         parentMenuSet.showMenu(_this);
      }
   }

   function child_deactivate() {
      for (var i = 0; i < childMenus.length; i++) {
         if (childMenus[i] == this) {
            dehighlight(elmCache["item"][i]);
            break;
         }
      }
   }

   function child_queue() {
      parentMenuSet.hideMenu(_this);
   }

   function child_dequeue() {
      parentMenuSet.showMenu(_this);
   }

   function toString() {
      var aHtml = [];
      var sClassName = "transMenu" + (oActuator.constructor != TransMenuItem ? " top" : "");

      for (var i = 0, item = null; item = this.items[i]; i++) {
         aHtml[i] = item.toString(childMenus[i]);
      }

      return '<div id="' + id + '" class="' + sClassName + '">' +
             '<div class="content"><table class="items" cellpadding="0" cellspacing="0" border="0">' +
             '<tr><td colspan="2"><img src="' + TransMenu.spacerGif + '" width="1" height="' + TransMenu.menuPadding + '"></td></tr>' +
             aHtml.join('') +
             '<tr><td colspan="2"><img src="' + TransMenu.spacerGif + '" width="1" height="' + TransMenu.menuPadding + '"></td></tr></table>' +
             '<div class="shadowBottom"><img src="' + TransMenu.spacerGif + '" width="1" height="1"></div>' +
             '<div class="shadowRight"><img src="' + TransMenu.spacerGif + '" width="1" height="1"></div>' +
             '<div class="background"><img src="' + TransMenu.spacerGif + '" width="1" height="1"></div>' +
             '</div></div>';
   }
}


//==================================================================================================
// TransMenuSet
//==================================================================================================
// iDirection           : The direction to slide out. One of TransMenu.direction.
// iLeft                : Left pixel offset of menus from actuator
// iTop                 : Top pixel offset of menus from actuator
// iReferencePoint      : Corner of actuator to measure from. One of TransMenu.referencePoint.
//==================================================================================================
TransMenuSet.registry = [];

function TransMenuSet(iDirection, iLeft, iTop, iReferencePoint) {
   // public methods
   this.addMenu = addMenu;
   this.showMenu = showMenu;
   this.hideMenu = hideMenu;
   this.hide = hide;
   this.hideCurrent = hideCurrent;

   // initialization
   var menus = [];
   var _this = this;
   var current = null;

   this.index = TransMenuSet.registry.length;
   TransMenuSet.registry[this.index] = this;

   // method implimentations...
   function addMenu(oActuator) {
      var m = new TransMenu(oActuator, iDirection, iLeft, iTop, iReferencePoint, this);
      menus[menus.length] = m;
      return m;
   }

   function showMenu(oMenu) {
      if (oMenu != current) {
         // close currently open menu
         if (current != null) hide(current);

         // set current menu to this one
         current = oMenu;

         // if this menu is closed, open it
         oMenu.show();
      }
      else {
         // hide pending calls to close this menu
         cancelHide(oMenu);
      }
   }

   function hideMenu(oMenu) {
      //dbg_dump("hideMenu a " + oMenu.index);
      if (current == oMenu && oMenu.isOpen) {
         //dbg_dump("hideMenu b " + oMenu.index);
         if (!oMenu.hideTimer) scheduleHide(oMenu);
      }
   }

   function scheduleHide(oMenu) {
      //dbg_dump("scheduleHide " + oMenu.index);
      oMenu.onqueue();
      oMenu.hideTimer = window.setTimeout("TransMenuSet.registry[" + _this.index + "].hide(TransMenu.registry[" + oMenu.index + "])", TransMenu.hideDelay);
   }

   function cancelHide(oMenu) {
      //dbg_dump("cancelHide " + oMenu.index);
      if (oMenu.hideTimer) {
         oMenu.ondequeue();
         window.clearTimeout(oMenu.hideTimer);
         oMenu.hideTimer = null;
      }
   }

   function hide(oMenu) {
      if (!oMenu && current) oMenu = current;

      if (oMenu && current == oMenu && oMenu.isOpen) {
         hideCurrent();
      }
   }

   function hideCurrent() {
      if (null != current) {
         cancelHide(current);
         current.hideTimer = null;
         current.hide();
         current = null;
      }
   }
}

//==================================================================================================
// TransMenuItem (internal)
// represents an item in a dropdown
//==================================================================================================
// sText        : The item display text
// sUrl         : URL to load when the item is clicked
// oParent      : Menu this item is a part of
//==================================================================================================
function TransMenuItem(sText, sUrl, oParent) {
   this.toString = toString;
   this.text = sText;
   this.url = sUrl;
   this.parentMenu = oParent;

   function toString(bDingbat) {
      var sDingbat = bDingbat ? TransMenu.dingbatOff : TransMenu.spacerGif;
      var iEdgePadding = TransMenu.itemPadding + TransMenu.menuPadding;
      var sPaddingLeft = "padding:" + TransMenu.itemPadding + "px; padding-left:" + iEdgePadding + "px;"
      var sPaddingRight = "padding:" + TransMenu.itemPadding + "px; padding-right:" + iEdgePadding + "px;"

      return '<tr class="item"><td nowrap style="' + sPaddingLeft + '">' +
             sText + '</td><td width="14" style="' + sPaddingRight + '">' +
             '<img src="' + sDingbat + '" width="14" height="14"></td></tr>';
   }
}


//=====================================================================
// Accel[erated] [an]imation object
// change a property of an object over time in an accelerated fashion
//=====================================================================
// obj  : reference to the object whose property you'd like to animate
// prop : property you would like to change eg: "left"
// to   : final value of prop
// time : time the animation should take to run
// zip    : optional. specify the zippiness of the acceleration. pick a
//          number between -1 and 1 where -1 is full decelerated, 1 is
//          full accelerated, and 0 is linear (no acceleration). default
//          is 0.
// unit    : optional. specify the units for use with prop. default is
//          "px".
//=====================================================================
// bezier functions lifted from the lib_animation.js file in the
// 13th Parallel API. www.13thparallel.org
//=====================================================================

function Accelimation(from, to, time, zip) {
   if (typeof zip  == "undefined") zip  = 0;
   if (typeof unit == "undefined") unit = "px";

   this.x0      = from;
   this.x1      = to;
   this.dt      = time;
   this.zip     = -zip;
   this.unit    = unit;
   this.timer   = null;
   this.onend   = new Function();
   this.onframe = new Function();
}



//=====================================================================
// public methods
//=====================================================================

// after you create an accelimation, you call this to start it-a runnin'
Accelimation.prototype.start = function() {
   this.t0 = new Date().getTime();
   this.t1 = this.t0 + this.dt;
   var dx    = this.x1 - this.x0;
   this.c1 = this.x0 + ((1 + this.zip) * dx / 3);
   this.c2 = this.x0 + ((2 + this.zip) * dx / 3);
   Accelimation._add(this);
}

// and if you need to stop it early for some reason...
Accelimation.prototype.stop = function() {
   Accelimation._remove(this);
}



//=====================================================================
// private methods
//=====================================================================

// paints one frame. gets called by Accelimation._paintAll.
Accelimation.prototype._paint = function(time) {
   if (time < this.t1) {
      var elapsed = time - this.t0;
      this.onframe(Accelimation._getBezier(elapsed/this.dt,this.x0,this.x1,this.c1,this.c2));
   }
   else this._end();
}

// ends the animation
Accelimation.prototype._end = function() {
   Accelimation._remove(this);
   this.onframe(this.x1);
   this.onend();
}




//=====================================================================
// static methods (all private)
//=====================================================================

// add a function to the list of ones to call periodically
Accelimation._add = function(o) {
   var index = this.instances.length;
   this.instances[index] = o;
   // if this is the first one, start the engine
   if (this.instances.length == 1) {
      this.timerID = window.setInterval("Accelimation._paintAll()", this.targetRes);
   }
}

// remove a function from the list
Accelimation._remove = function(o) {
   for (var i = 0; i < this.instances.length; i++) {
      if (o == this.instances[i]) {
         this.instances = this.instances.slice(0,i).concat( this.instances.slice(i+1) );
         break;
      }
   }
   // if that was the last one, stop the engine
   if (this.instances.length == 0) {
      window.clearInterval(this.timerID);
      this.timerID = null;
   }
}

// "engine" - call each function in the list every so often
Accelimation._paintAll = function() {
   var now = new Date().getTime();
   for (var i = 0; i < this.instances.length; i++) {
      this.instances[i]._paint(now);
   }
}


// Bezier functions:
Accelimation._B1 = function(t) { return t*t*t }
Accelimation._B2 = function(t) { return 3*t*t*(1-t) }
Accelimation._B3 = function(t) { return 3*t*(1-t)*(1-t) }
Accelimation._B4 = function(t) { return (1-t)*(1-t)*(1-t) }


//Finds the coordinates of a point at a certain stage through a bezier curve
Accelimation._getBezier = function(percent,startPos,endPos,control1,control2) {
   return endPos * this._B1(percent) + control2 * this._B2(percent) + control1 * this._B3(percent) + startPos * this._B4(percent);
}


//=====================================================================
// static properties
//=====================================================================

Accelimation.instances = [];
Accelimation.targetRes = 10;
Accelimation.timerID = null;


//=====================================================================
// IE win memory cleanup
//=====================================================================

if (window.attachEvent) {
    var cearElementProps = [
        'data',
        'onmouseover',
        'onmouseout',
        'onmousedown',
        'onmouseup',
        'ondblclick',
        'onclick',
        'onselectstart',
        'oncontextmenu'
    ];

   window.attachEvent("onunload", function() {
      var el;
      for (var d = document.all.length;d--;) {
         el = document.all[d];
         for (var c = cearElementProps.length;c--;) {
            el[cearElementProps[c]] = null;
         }
      }
   });
}