ypSlideOutMenu.Registry = [];
ypSlideOutMenu.aniLen = 200;
ypSlideOutMenu.hideDelay = 500;
ypSlideOutMenu.minCPUResolution = 10;
ypSlideOutMenu.classNames = [];

function ypSlideOutMenu(id, liID, 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.li = document.getElementById(liID);
		this.classNameOff = this.li.className;
		this.classNameOver = this.li.className + ' selected';
		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 = "yp_"+id;
		eval(this.gRef+"=this");
		ypSlideOutMenu.Registry[id] = this;
		
		var d = document;
		d.write('<style type="text/css">');
		d.write('#' + this.id + 'Container { visibility:hidden; ');
		d.write('left:' + left + 'px; ');
		d.write('top:' + top + 'px; ');
		d.write('overflow:hidden; }');
		d.write('#' + this.id + 'Container, #' + this.id + 'Content { position:absolute; ');
		d.write('z-index:100; ');
		d.write('width:' + width + 'px; ');
		d.write('height:' + height + 'px; ');
		d.write('clip:rect(0 ' + width + ' ' + height + ' 0); ');
		d.write('}');
		d.write('</style>');
		
		this.load();
	}
}

ypSlideOutMenu.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) / ypSlideOutMenu.aniLen / ypSlideOutMenu.aniLen; 
		if (this.ns4) this.menu.captureEvents(Event.MOUSEOVER | Event.MOUSEOUT);
		this.menu.onmouseover = new Function("ypSlideOutMenu.showMenu('" + this.id + "')");
		this.menu.onmouseout = new Function("ypSlideOutMenu.hideMenu('" + this.id + "')");
		this.endSlide();
	}
}

ypSlideOutMenu.showMenu = function(id)
{
	var reg = ypSlideOutMenu.Registry;
	var obj = ypSlideOutMenu.Registry[id];
	if (obj.container) 
	{
		obj.li.className = obj.classNameOver;
		obj.over = true;
		for (var i=0; i<reg.length; i++)
		{
			var menu = reg[i]; 
			if (id != menu)
				ypSlideOutMenu.hide(menu);
		}
		if (obj.hideTimer) 
			reg[id].hideTimer = window.clearTimeout(reg[id].hideTimer); 
		if (!obj.open && !obj.aniTimer) reg[id].startSlide(true);
	}
}

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

ypSlideOutMenu.hide = function(id)
{
	var obj = ypSlideOutMenu.Registry[id];
	obj.li.className = obj.classNameOff;
	obj.over = false;
	if (obj.hideTimer) window.clearTimeout(obj.hideTimer);
	obj.hideTimer = 0;
	if (obj.open && !obj.aniTimer) obj.startSlide(false);
}
	
ypSlideOutMenu.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()", ypSlideOutMenu.minCPUResolution);
}

ypSlideOutMenu.prototype.slide = function() 
{
	var elapsed = (new Date()).getTime() - this.startTime;
	if (elapsed > ypSlideOutMenu.aniLen) 
		this.endSlide();
	else 
	{
		var d = Math.round(Math.pow(ypSlideOutMenu.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);
	}
}

ypSlideOutMenu.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);
}

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

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

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

ypSlideOutMenu.prototype.onactivate = function() { }

ypSlideOutMenu.prototype.ondeactivate = function() { }

/*
var menus = [                   
	new ypSlideOutMenu("page_tasks", "down", 165, 200, 146, 230)
]

for (var i=0; i<menus.length; i++) 
{
	menus[i].onactivate = new Function("document.getElementById('nav" + i + "').className='over';");
	menus[i].ondeactivate = new Function("document.getElementById('nav" + i + "').className='';");
}
*/