var slideInUse = new Array();
function Slide(objId, options) 
{	
	this.obj = document.getElementById(objId);
	this.duration = 1;
	this.height = parseInt(this.obj.style.height);
	if(typeof options != 'undefined') 
	{ 
		this.options = options;
	}
	else 
	{
		this.options = {};
	}
	if(this.options.duration)
	{ 
		this.duration = this.options.duration;
	}

	this.up = function()
	{
		this.curHeight = this.height;
		this.newHeight = '1';
		if(slideInUse[objId] != true)
		{
			var finishTime = this.slide();
			window.setTimeout("Slide('"+objId+"').finishup("+this.height+");",finishTime);
		}
	}
	this.down = function()
	{
		if (this.obj.style.display == 'block')
		{
			this.curHeight = this.height;
			this.newHeight = '1';
			if(slideInUse[objId] != true)
			{
				var finishTime = this.slide();
				window.setTimeout("Slide('"+objId+"').finishup("+this.height+");",finishTime);
			}
		}
		else
		{
			this.newHeight = this.height;
			this.curHeight = '1';
			if(slideInUse[objId] != true)
			{
				this.obj.style.height = '1px';
				this.obj.style.display = 'block';
				this.slide();
			}
		}
	}
	this.slide = function()
	{
		slideInUse[objId] = true;
		var frames = 30 * duration; // Running at 30 fps
		var tIncrement = (duration*1000) / frames;
		tIncrement = Math.round(tIncrement);
		var sIncrement = (this.curHeight-this.newHeight) / frames;
		var frameSizes = new Array();
		for(var i=0; i < frames; i++)
		{
			if(i < frames/2)
			{
				frameSizes[i] = (sIncrement * (i/frames))*4;
			}
			else
			{
				frameSizes[i] = (sIncrement * (1-(i/frames)))*4;
			}
		}
		for(var i=0; i < frames; i++)
		{
			this.curHeight = this.curHeight -frameSizes[i];
			window.setTimeout("document.getElementById('"+objId+"').style.height='"+Math.round(this.curHeight)+"px';",tIncrement * i);
		}
		window.setTimeout("delete(slideInUse['"+objId+"']);",tIncrement * i);
		if(this.options.onComplete)
		{
			window.setTimeout(this.options.onComplete, tIncrement * (i-2));
		}
		return tIncrement * i;
	}
	this.finishup = function(height)
	{
		this.obj.style.display = 'none';
		this.obj.style.height = height + 'px';
	}
	return this;
}