// Chrome Drop Down Menu v2.01- Author: Dynamic Drive (http://www.dynamicdrive.com)
// Last updated: November 14th 06- added iframe shim technique

var cssdropdown =
{
	disappeardelay: 250,	// set delay in miliseconds before menu disappears onmouseout
	disablemenuclick: true, // when user clicks on a menu item with a drop down menu, disable menu item's link?
	enableswipe: 1,			// enable swipe effect? 1 for yes, 0 for no
	enableiframeshim: 1,	// enable "iframe shim" technique to get drop down menus to correctly appear on top of controls such as form objects in IE5.5/IE6? 1 for yes, 0 for no

	// NOTE: No need to edit beyond here
	dropmenuobj: null, 
	ie: document.all, 
	firefox: document.getElementById && !document.all, 
	swipetimer: undefined, 
	bottomclip: 0,

	getposOffset: function (what, offsettype)
	{
		var totaloffset = (offsettype == "left") ? what.offsetLeft : what.offsetTop;
		var parentEl = what.offsetParent;
		while (parentEl !== null)
		{
			totaloffset = (offsettype == "left") ? totaloffset + parentEl.offsetLeft : totaloffset + parentEl.offsetTop;
			parentEl = parentEl.offsetParent;
		}
		return totaloffset;
	},

	swipeeffect: function ()
	{
		if (this.bottomclip < parseInt (this.dropmenuobj.offsetHeight))
		{
			this.bottomclip += 10 + (this.bottomclip / 10); // unclip drop down menu visibility gradually
			this.dropmenuobj.style.clip = "rect (0 auto "+ this.bottomclip + "px 0);";
		}
		else
		{
			return;
		}
		
		this.swipetimer = setTimeout ("cssdropdown.swipeeffect ();", 10);
	},

	showhide: function (obj, e)
	{
		if (this.ie || this.firefox)
		{
			this.dropmenuobj.style.left = this.dropmenuobj.style.top = "-500px";
		}
			
		if (e.type == "click" && obj.visibility == hidden || e.type == "mouseover")
		{
			if (this.enableswipe == 1)
			{
				if (typeof (this.swipetimer) != "undefined")
				{
					clearTimeout (this.swipetimer);
				}
				obj.clip = "rect (0 auto 0 0)"; // hide menu via clipping
				this.bottomclip = 0;
				this.swipeeffect ();
			}
			obj.visibility = "visible";
		}
		else if (e.type == "click")
		{
			obj.visibility = "hidden";
		}
	},

	iecompattest: function ()
	{
		return (document.compatMode && document.compatMode != "BackCompat") ? document.documentElement : document.body;
	},

	clearbrowseredge: function (obj, whichedge)
	{
		var edgeoffset = 0;
		if (whichedge == "rightedge")
		{
			var windowedge = this.ie && !window.opera ? this.iecompattest ().scrollLeft + this.iecompattest ().clientWidth - 15 : window.pageXOffset + window.innerWidth - 15;
			this.dropmenuobj.contentmeasure = this.dropmenuobj.offsetWidth;
			if (windowedge - this.dropmenuobj.x < this.dropmenuobj.contentmeasure) // move menu to the left?
			{
				edgeoffset = this.dropmenuobj.contentmeasure - obj.offsetWidth;
			}
		}
		else
		{
			var topedge = this.ie && !window.opera ? this.iecompattest ().scrollTop : window.pageYOffset;
			var windowedge = this.ie && !window.opera ? this.iecompattest ().scrollTop + this.iecompattest ().clientHeight - 15 : window.pageYOffset + window.innerHeight - 18;
			this.dropmenuobj.contentmeasure = this.dropmenuobj.offsetHeight;
			if (windowedge - this.dropmenuobj.y < this.dropmenuobj.contentmeasure) // move up?
			{ 
				edgeoffset = this.dropmenuobj.contentmeasure + obj.offsetHeight;
				if ((this.dropmenuobj.y - topedge) < this.dropmenuobj.contentmeasure) // up no good either?
				{
					edgeoffset = this.dropmenuobj.y + obj.offsetHeight - topedge;
				}
			}
		}
		return edgeoffset;
	},

	dropit: function (obj, e, dropmenuID)
	{
		if (this.dropmenuobj !== null) // hide previous menu
		{
			this.dropmenuobj.style.visibility = "hidden"; //hide menu
		}
		
		this.clearhidemenu ();
		
		if (this.ie || this.firefox)
		{
			obj.onmouseout = function () { cssdropdown.delayhidemenu(); };
			obj.onclick = function () { return !cssdropdown.disablemenuclick; }; // disable main menu item link onclick?
			this.dropmenuobj = document.getElementById (dropmenuID);
			this.dropmenuobj.onmouseover = function () { cssdropdown.clearhidemenu(); };
			this.dropmenuobj.onmouseout = function (e) { cssdropdown.dynamichide(e); };
			this.dropmenuobj.onclick = function () { cssdropdown.delayhidemenu(); };
			this.showhide (this.dropmenuobj.style, e);
			this.dropmenuobj.x = this.getposOffset (obj, "left");
			this.dropmenuobj.y = this.getposOffset (obj, "top");
			this.dropmenuobj.style.left = this.dropmenuobj.x - this.clearbrowseredge (obj, "rightedge") + "px";
			this.dropmenuobj.style.top = this.dropmenuobj.y - this.clearbrowseredge (obj, "bottomedge") + obj.offsetHeight + 1 + "px";
			this.positionshim (); // call iframe shim function
		}
	},

	positionshim: function () // display iframe shim function
	{ 
		if (this.enableiframeshim && typeof(this.shimobject) != "undefined")
		{
			if (this.dropmenuobj.style.visibility == "visible")
			{
				this.shimobject.style.width = this.dropmenuobj.offsetWidth + "px";
				this.shimobject.style.height = this.dropmenuobj.offsetHeight + "px";
				this.shimobject.style.left = this.dropmenuobj.style.left;
				this.shimobject.style.top = this.dropmenuobj.style.top;
			}
			this.shimobject.style.display = (this.dropmenuobj.style.visibility == "visible") ? "block" : "none";
		}
	},

	hideshim: function ()
	{
		if (this.enableiframeshim && typeof this.shimobject != "undefined")
		{
			this.shimobject.style.display = 'none';
		}
	},

	contains_firefox: function(a, b)
	{
		while (b.parentNode)
		{
			if ((b = b.parentNode) == a)
			{
				return true;
			}
		}
		return false;
	},

	dynamichide: function (e)
	{
		var evtobj = window.event ? window.event : e;
		if (this.ie && !this.dropmenuobj.contains (evtobj.toElement))
		{
			this.delayhidemenu ();
		}
		else if (this.firefox && e.currentTarget != evtobj.relatedTarget && !this.contains_firefox (evtobj.currentTarget, evtobj.relatedTarget))
		{
			this.delayhidemenu ();
		}
	},

	delayhidemenu: function ()
	{
		this.delayhide = setTimeout ("cssdropdown.dropmenuobj.style.visibility = 'hidden'; cssdropdown.hideshim ();", this.disappeardelay); // hide menu
	},

	clearhidemenu: function ()
	{
		if (this.delayhide != "undefined")
		{
			clearTimeout (this.delayhide);
		}
	},

	startchrome: function ()
	{
		for (var ids = 0; ids < arguments.length; ids++)
		{
			var menuitems = document.getElementById (arguments[ids]).getElementsByTagName ("a");
			for (var i = 0; i < menuitems.length; i++)
			{
				if (menuitems[i].getAttribute ("rel"))
				{
					var relvalue = menuitems[i].getAttribute ("rel");
					menuitems[i].onmouseover = function (e)
												{
													var event = (typeof(e) != "undefined") ? e : window.event;
													cssdropdown.dropit (this, event, this.getAttribute ("rel"));
												};
				}
			}
		}
		if (window.createPopup && !window.XmlHttpRequest)  // if IE5.5 to IE6, create iframe for iframe shim technique
		{
			document.write ('<IFRAME id="iframeshim"  src="" style="display: none; left: 0; top: 0; z-index: 90; position: absolute; filter: progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)" frameBorder="0" scrolling="no"></IFRAME>');
			this.shimobject = document.getElementById ("iframeshim"); // reference iframe object
		}
	}
}