function slide(Id, interval, to){
	var obj = document.getElementById(Id);
	var H, step = 20;

	if (obj == null) return;
	if (to == undefined) { // user clicking
		if (obj._slideStart == true) return;
		if (obj._expand == true) {
			to = 0;
			obj.style.overflow = "hidden";
		} else {
			slide.addId(Id);
			for(var i=0; i < slide.objects.length; i++) {
				if (slide.objects[i].id != Id && slide.objects[i]._expand == true) {
					slide(slide.objects[i].id);
				}
			}

			obj.style.height = "";
			obj.style.overflow = "";
			obj.style.display = "block";
			to = obj.offsetHeight;
			obj.style.overflow = "hidden";
			obj.style.height = "0px";
		}
		obj._slideStart = true;
	}

	step = ((to > 0) ? 1:-1) * step;
	interval = ((interval==undefined)?1:interval);
	obj.style.height = (H=((H=(isNaN(H=parseInt(obj.style.height))?0:H))+step<0)?0:H+step)+"px";

	if (H <= 0) {
		obj.style.display = "none";
		obj.style.overflow = "hidden";
		obj._expand = false;
		obj._slideStart = false;
	} else if (to > 0 && H >= to) {
		obj.style.display = "block";
		obj.style.overflow = "visible";
		obj.style.height = H + "px";
		obj._expand = true;
		obj._slideStart = false;
	} else {
		setTimeout("slide('"+Id+"' , "+interval+", "+to+");", interval);
	}
}

slide.objects = new Array();
slide.addId = function(Id){
	for (var i=0; i < slide.objects.length; i++) {
		if (slide.objects[i].id == Id) return true;
	}
	slide.objects[slide.objects.length] = document.getElementById(Id);
}