// JavaScript Document

var prevImg = "all"; // initialize to default selected id
function showOn(obj)
{
var id = document.getElementById(obj);
var prevId = document.getElementById(prevImg);
var path = "../images/homepage/directory_category-";
var imgOn = "-on.gif";
var imgOff = "-default.gif";

if(prevImg == obj)
{
id.src = path+obj+imgOn;
}
else
{
prevId.src = path+prevImg+imgOff;
id.src = path+obj+imgOn;
}
prevImg = obj;
}