if ( document.images )
{
 pics = new Array(6);
img_preload ("act");
img_preload ("sho");
img_preload ("pho");
img_preload ("pri");
img_preload ("ref");
img_preload ("con");
}
function img_preload (what)
{
    pics[what] = new Array(2);
    pics[what][0] = new Image(156,18);
    pics[what][0].src = "./images/menu_e/" + what + "_off.jpg"
    pics[what][1] = new Image(156,18);
    pics[what][1].src = "./images/menu_e/" + what + "_on.jpg"}  
function roll(what,state)
{
	if ( document.images )
	{
 	   document.images[what].src = pics[what][state].src;
	}
}