ypSlideOutMenu.Registry = []
ypSlideOutMenu.aniLen = 500
ypSlideOutMenu.hideDelay = 500
ypSlideOutMenu.minCPUResolution = 10

// constructor
function ypSlideOutMenu(id, dir, left, top, width, height)
{
	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

	// global reference to this object
	this.gRef = "ypSlideOutMenu_"+id
	eval(this.gRef+"=this")

	// add this menu object to an internal list of all menus
	ypSlideOutMenu.Registry[id] = this

	var d = document

	var strCSS = '<style type="text/css">';
	strCSS += '#' + this.id + 'Container { visibility: hidden; display: block;'
	strCSS += 'left:' + left + 'px; '
	strCSS += 'top:' + top + 'px; '
	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()
}

ypSlideOutMenu.prototype.load = function() {
	var trigger = document.getElementById(this.id + "Trigger");
	var obj1 = document.getElementById(this.id + "Container")
	if (obj1) var obj2 = document.getElementById(this.id + "Content")
	var temp

	if (!obj1 || !obj2) window.setTimeout(this.gRef + ".load()", 100)
	else {
		this.trigger	= trigger
		this.container	= obj1
		this.menu		= obj2
		this.homePos	= eval("0" + this.dirType + this.dim)
		this.outPos		= 0
		this.accelConst	= (this.outPos - this.homePos) / ypSlideOutMenu.aniLen / ypSlideOutMenu.aniLen 

		// set event handlers.
		this.trigger.onmouseover = new Function("ypSlideOutMenu.showMenu('" + this.id + "')");
		this.trigger.onmouseout = new Function("ypSlideOutMenu.hideMenu('" + this.id + "')");
		this.menu.onmouseover = new Function("ypSlideOutMenu.showMenu('" + this.id + "')")
		this.menu.onmouseout = new Function("ypSlideOutMenu.hideMenu('" + this.id + "')")

		//set initial state
		this.endSlide()
	}
}
	
ypSlideOutMenu.showMenu = function(id)
{
	var reg = ypSlideOutMenu.Registry
	var obj = ypSlideOutMenu.Registry[id]
	
	if (obj.container) {
		obj.over = true

		// close other menus.
		for (menu in reg) if (id != menu) ypSlideOutMenu.hide(menu)

		// if this menu is scheduled to close, cancel it.
		if (obj.hideTimer) { reg[id].hideTimer = window.clearTimeout(reg[id].hideTimer) }

		// if this menu is closed, open it.
		if (!obj.open && !obj.aniTimer) reg[id].startSlide(true)
	}
}

ypSlideOutMenu.hideMenu = function(id)
{
	// schedules the menu to close after <hideDelay> ms, which
	// gives the user time to cancel the action if they accidentally moused out
	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.hideAll = function()
{
	var reg = ypSlideOutMenu.Registry
	for (menu in reg) {
		ypSlideOutMenu.hide(menu);
		if (menu.hideTimer) window.clearTimeout(menu.hideTimer);
	}
}

ypSlideOutMenu.hide = function(id)
{
	var obj = ypSlideOutMenu.Registry[id]
	obj.over = false

	if (obj.hideTimer) window.clearTimeout(obj.hideTimer)
	
	// flag that this scheduled event has occured.
	obj.hideTimer = 0

	// if this menu is open, close it.
	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.container.style
	s.visibility = bShow ? "visible" : "hidden"
}
ypSlideOutMenu.prototype.moveTo = function(p) { 
	this.menu.style[this.orientation == "h" ? "left" : "top"] = p + "px"
}
ypSlideOutMenu.prototype.getPos = function(c) {
	return parseInt(this.menu.style[c])
}

// events
ypSlideOutMenu.prototype.onactivate		= function() { }
ypSlideOutMenu.prototype.ondeactivate	= function() { }