function reveal()
{
	var listing = document.getElementById("casestudy");
	var lnks = listing.getElementsByTagName("a");
	for (var i = 0; i < lnks.length; i++)
	{
		lnks[i].onclick = function()
		{
			showDivs (this.rel);
			return false;
		}
	}
}

function showDivs(div)
{
	var sel = document.getElementById(div);
	var divs = document.getElementById("showcase").getElementsByTagName("div");
	for (var i = 0; i < divs.length; i++)
	{
		divs[i].style.display = "none";
	}
	sel.style.display = "block"; 
}

addLoadEvent(reveal);