function popup(mylink, windowname, w, h)
{
	var wide = (w == null) ? 815 : w;
    var high = (h == null) ? 500 : h;
	var centerwide = (screen.width - wide) / 2;
    var centerhigh = (screen.height - high) / 2;
	 

//	alert('wide is ' + wide + ' and high is ' + high);
if (! window.focus)return true;
var href;

if (typeof(mylink) == 'string')
   href=mylink;
else 
   href=mylink.href;
//	window.open(href, windowname, 'width=800,height=500,scrollbars=yes,resizable=yes');
	window.open(href, windowname, 'width='+wide+',height='+high+',scrollbars=yes,resizable=yes,top='+centerhigh+',left='+centerwide);
return false;
}