/*****************************************************
* dropMenu
// usage: new dropMenu('id', 'down', 170, 400, 'left', 'bottom', true)
// 		  onmouseover="dropMenu.showMenu('tn15397',this)"
//		  onmouseout="dropMenu.hideMenu('tn15397',this)"
*****************************************************/
dropMenu.Registry = []
dropMenu.aniLen = 250
dropMenu.hideDelay = 1000
dropMenu.minCPUResolution = 10
// constructor

//fires on instantiation of each new menu object
function dropMenu(id, dir, width, height, hAlign, vAlign, animation)
{
this.ie = document.all ? 1 : 0
this.ns4 = document.layers ? 1 : 0
this.dom = document.getElementById ? 1 : 0
if (this.ie || this.ns4 || this.dom) 
	{
	this.id = id
	this.hAlign = hAlign
	this.vAlign = vAlign
	this.dir = dir
	this.animation = animation
	this.orientation = dir == "left" || dir == "right" ? "h" : "v"
	this.dirType = dir == "right" || dir == "down" ? "-" : "+"
	this.dim = this.orientation == "h" ? width : height
	this.hideTimer = false
	this.aniTimer = false
	this.open = false
	this.over = false
	this.startTime = 0
	this.gRef = "dropMenu_"+id
	
	this.width = width
	this.height = height
		
	eval(this.gRef+"=this")
	dropMenu.Registry[id] = this
	var d = document
	var strCSS = '<style type="text/css">';
	strCSS += '#' + this.id + 'Container { visibility:hidden; '
	strCSS += 'overflow:hidden; z-index:10000; }'
	strCSS += '#' + this.id + 'Container, #' + this.id + 'Content { position:absolute; '
	strCSS += 'width:' + width + 'px; '
	strCSS += 'height:' + height + 'px; '
	strCSS += 'clip:rect(0 ' + width + ' ' + height + ' 0); '
	strCSS += '}'
	strCSS += '</style>'
	d.write(strCSS)
	this.load()
	}
}

dropMenu.prototype.load = function() 
{
	var d = document
	var lyrId1 = this.id + "Container"
	var lyrId2 = this.id + "Content"
	var obj1 = this.dom ? d.getElementById(lyrId1) : this.ie ? d.all[lyrId1] : d.layers[lyrId1]
	if (obj1) var obj2 = this.ns4 ? obj1.layers[lyrId2] : this.ie ? d.all[lyrId2] : d.getElementById(lyrId2)
	var temp
	if (!obj1 || !obj2) window.setTimeout(this.gRef + ".load()", 100)
	else {
		this.container = obj1
		this.menu = obj2
		this.style = this.ns4 ? this.menu : this.menu.style
		this.containerStyle = this.ns4 ? this.container : this.container.style
		this.homePos = eval("0" + this.dirType + this.dim)
		this.outPos = 0
		this.accelConst = (this.outPos - this.homePos) / dropMenu.aniLen / dropMenu.aniLen 
		// set event handlers.
		if (this.ns4) this.menu.captureEvents(Event.MOUSEOVER | Event.MOUSEOUT);
		this.menu.onmouseover = new Function("dropMenu.showMenu('" + this.id + "')")
		this.menu.onmouseout = new Function("dropMenu.hideMenu('" + this.id + "')")
		//set initial state
		this.endSlide()
	}
}

dropMenu.showMenu = function(id, object)
{
	var reg = dropMenu.Registry
	var obj = dropMenu.Registry[id]
	if( obj )
	{
		if (obj.container) {
			obj.over = true
			for (menu in reg) if (id != menu) dropMenu.hide(menu)
			if (obj.hideTimer) { reg[id].hideTimer = window.clearTimeout(reg[id].hideTimer) }
			
			if( object )
			{
				var left
				if( obj.hAlign == "right" ) 
					left = findPosX(object) + object.offsetWidth
				else
					left = findPosX(object)
					
				var top
				if( obj.vAlign == "top" )
					top = findPosY(object)
				else
					top = (findPosY(object) + object.offsetHeight)
				
				obj.containerStyle["left"] = obj.ns4 ? left : left + "px"
				obj.containerStyle["top"] = obj.ns4 ? top : top + "px"
			}
			
			if (!obj.open && !obj.aniTimer) reg[id].startSlide(true)
		}
	}
	else
	{
		for (menu in reg) if (id != menu) dropMenu.hide(menu)
	}
}

dropMenu.hideMenu = function(id)
{
	var obj = dropMenu.Registry[id]
	if( obj )
	{
		if (obj.container) {
			if (obj.hideTimer) window.clearTimeout(obj.hideTimer)
			obj.hideTimer = window.setTimeout("dropMenu.hide('" + id + "')", dropMenu.hideDelay);
		}
	}
}

dropMenu.hideAll = function()
{
	var reg = dropMenu.Registry
	for (menu in reg) {
		dropMenu.hide(menu);
		if (menu.hideTimer) window.clearTimeout(menu.hideTimer);
	}
}

dropMenu.hide = function(id)
{
	var obj = dropMenu.Registry[id]
	obj.over = false
	if (obj.hideTimer) window.clearTimeout(obj.hideTimer)
	obj.hideTimer = 0
	if (obj.open && !obj.aniTimer) obj.startSlide(false)
}

dropMenu.prototype.startSlide = function(open) {
	this[open ? "onactivate" : "ondeactivate"]()
	this.open = open
	if (open) this.setVisibility(true)
	this.startTime = (new Date()).getTime() 
	this.aniTimer = window.setInterval(this.gRef + ".slide()", dropMenu.minCPUResolution)
}

dropMenu.prototype.slide = function() {
	var elapsed = (new Date()).getTime() - this.startTime
	if (elapsed > dropMenu.aniLen || this.animation == false) this.endSlide()
	else {
		var d = Math.round(Math.pow(dropMenu.aniLen-elapsed, 2) * this.accelConst)
		if (this.open && this.dirType == "-") d = -d
		else if (this.open && this.dirType == "+") d = -d
		else if (!this.open && this.dirType == "-") d = -this.dim + d
		else d = this.dim + d
		this.moveTo(d)
	}
}

dropMenu.prototype.endSlide = function() {
	this.aniTimer = window.clearTimeout(this.aniTimer)
	this.moveTo(this.open ? this.outPos : this.homePos)
	if (!this.open) this.setVisibility(false)
	if ((this.open && !this.over) || (!this.open && this.over)) {
		this.startSlide(this.over)
	}
}

dropMenu.prototype.setVisibility = function(bShow) { 
	var s = this.ns4 ? this.container : this.container.style
	s.visibility = bShow ? "visible" : "hidden"
}

dropMenu.prototype.moveTo = function(p) { 
	this.style[this.orientation == "h" ? "left" : "top"] = this.ns4 ? p : p + "px"
}

dropMenu.prototype.getPos = function(c) {
	return parseInt(this.style[c])
}

dropMenu.prototype.onactivate = function() {}
dropMenu.prototype.ondeactivate = function() { }

function findPosX(obj)
{
	var curleft = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curleft += obj.offsetLeft
			obj = obj.offsetParent;
		}
	}
	else if (obj.x)
		curleft += obj.x;
	return curleft;
}

function findPosY(obj)
{
	var curtop = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curtop += obj.offsetTop
			obj = obj.offsetParent;
		}
	}
	else if (obj.y)
		curtop += obj.y;
	return curtop;
}