function precache_rollOvers()
{
ro_images = new Array("button.home","button.company","button.search","button.login", "button.help", "button.services", "button.site-map", "button.contact");
ro_cache = new Array();

for (counter in ro_images) {
	original_image=ro_images[counter];
//	document.images[original_image].src='/images/' + original_image + '.up.gif';
	ro_cache[counter] = new Image();
	ro_cache[counter].src='/images/' + original_image + '.down.gif';
	}
}

function rollOver (button_name) 
{
document.images[button_name].src='/images/' + button_name + '.down.gif';
}

function rollOut (button_name) {
document.images[button_name].src='/images/' + button_name + '.up.gif';
}