function roll(linkID, img_src) {
	document.getElementById(linkID).firstChild.src = img_src;
}

function popup(mylink, windowname)
{
if (! window.focus)return true;
var href;
if (typeof(mylink) == 'string')
   href=mylink;
else
   href=mylink.href;
window.open(href, windowname, 'width=864,height=480,scrollbars=yes');
return false;
}