var timerlen = 5;
var slideAniLen = 250;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var moving = new Array();
var dir = new Array();

function slidedown(objname){
		if(moving[objname])
				return;

		if(document.getElementById(objname).style.display != "none")
				return; // cannot slide down something that is already visible

		moving[objname] = true;
		dir[objname] = "down";

		startslide(objname);
}

function slideup(objname){
		if(moving[objname])
				return;

		if(document.getElementById(objname).style.display == "none")
				return; // cannot slide up something that is already hidden

		moving[objname] = true;
		dir[objname] = "up";

		startslide(objname);
}

function startslide(objname){
		obj[objname] = document.getElementById(objname);

		endHeight[objname] = parseInt(obj[objname].style.height);
		startTime[objname] = (new Date()).getTime();

		if(dir[objname] == "down"){
				obj[objname].style.height = "1px";
		}

		obj[objname].style.display = "block";

		if (timerID==null) timerID = new Array();
		timerID[objname] = setInterval('slidetick(\'' + objname + '\');',timerlen);
}

function slidetick(objname){
		var elapsed = (new Date()).getTime() - startTime[objname];

		if (elapsed > slideAniLen)
				endSlide(objname)
		else {
				var d =Math.round(elapsed / slideAniLen * endHeight[objname]);
				if(dir[objname] == "up")
						d = endHeight[objname] - d;

				obj[objname].style.height = d + "px";
		}

		return;
}

function endSlide(objname){
		clearInterval(timerID[objname]);

		if(dir[objname] == "up")
				obj[objname].style.display = "none";

		obj[objname].style.height = endHeight[objname] + "px";

		delete(moving[objname]);
		delete(timerID[objname]);
		delete(startTime[objname]);
		delete(endHeight[objname]);
		delete(obj[objname]);
		delete(dir[objname]);

		return;
}


function toggleSlide(objname){
	if(document.getElementById(objname).style.display == "none"){
		// div is hidden, so let's slide down
		slidedown(objname);
	}else{
		// div is not hidden, so slide up
		slideup(objname);
	}
}