function changeIt(id)
{
var theImg = document.getElementById(id).src;

var x = theImg.split("/");
var t = x.length-1;
var y = x[t];

if(y=='ico_ctrl-up.jpg')
{
if(id=='brands')
document.images.brands.src='img/ico_ctrl-down.jpg'

if(id=='feat')
document.images.prod.src='img/ico_ctrl-down.jpg'

if(id=='used')
document.images.used.src='img/ico_ctrl-down.jpg'

}
if(y=='ico_ctrl-down.jpg')
{
if(id=='brands')
document.images.brands.src='img/ico_ctrl-up.jpg'

if(id=='feat')
document.images.prod.src='img/ico_ctrl-up.jpg'

if(id=='used')
document.images.used.src='img/ico_ctrl-up.jpg'

}
}