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