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";

	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);
	}
}

function scrollIntoView(node) {
	var selectedPosX = 0;
	var selectedPosY = 0;

	while (node != null) {
		selectedPosX += node.offsetLeft;
		selectedPosY += node.offsetTop;
		node = node.offsetParent;
	}
	window.scrollTo(selectedPosX, selectedPosY);
}