dropMenu.Registry = [];
dropMenu.aniLen = 150;
dropMenu.hideDelay = 50;
dropMenu.minCPUResolution = 10;
// constructor

var _tpNS = (document.all)?false:true;

function getOffsetLeft (el) {
	var sl = el;
	var ol = el.offsetLeft;
	var sh = 0;
	while ((el = el.offsetParent) != null){
		ol += el.offsetLeft;
		if(el.offsetParent && el.offsetParent.offsetParent){
			var scrollLeft = el.offsetParent.scrollLeft;
			if(!isNaN(scrollLeft)){
				sh -= scrollLeft;
			}
		}
	}

	el = sl;
	if(_tpNS){
		while((el = el.parentNode) != null){
			if(el.parentNode && el.parentNode.parentNode
			&& !(el.parentNode.tagName &&
			el.parentNode.tagName.toUpperCase() == "BODY")){
				var scrollLeft = el.parentNode.scrollLeft;
				if(!isNaN(scrollLeft) && scrollLeft > 0 ){
					sh -= scrollLeft;
				}
			}
		}
	}
	return ol+sh;
}

function getAbsX(elt) {
	return parseInt(elt.x) ? elt.x : getAbsPos(elt, "Left");
}
function getAbsPos(elt, which) {
	iPos = 0;
	while (elt != null) {
		iPos += elt["offset" + which];
		elt = elt.offsetParent;
	}
	return iPos;
}

//fires on instantiation of each new menu object
function dropMenu(id, dir, left, top, width, height) {
	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.dir = dir
		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
		eval(this.gRef+"=this")
		dropMenu.Registry[id] = this;
		var newleft = getAbsX(document.getElementById('t_'+id)) - 5;
		var d = document
		var strCSS = '<style type="text/css">';
		strCSS += '#' + this.id + 'Container { display: none; '
		strCSS += 'left:' + newleft + 'px; '
		strCSS += 'top:' + top + 'px; '
		strCSS += 'overflow:hidden; z-index:1; }'
		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.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) {
	var reg = dropMenu.Registry
	var obj = dropMenu.Registry[id]
	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 (!obj.open && !obj.aniTimer) reg[id].startSlide(true)
	}
}

dropMenu.hideMenu = function(id) {
	var obj = dropMenu.Registry[id]
	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.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.display = bShow ? "block" : "none"
}

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 swap_css(css) {
	if (css!="") {
		var oLink = document.createElement("link")
		oLink.href = "/style/"+css+".css";
		oLink.rel = "stylesheet";
		oLink.type = "text/css";
		document.body.appendChild(oLink);
	}
}

function print_page() {
	swap_css('print');
	window.print();
}