function catOver(img,desc)
{
	img.style.backgroundImage="url(graphics/catBG.png)";
	var d=document.getElementById("category_description_div");
	d.innerHTML=desc;
}

function catOut(img)
{
	img.style.backgroundImage="none";
	var d=document.getElementById("category_description_div");
	d.innerHTML="Select a category at the right to view details here.";
}