function poppa(link, width, height)
{
 xpos = (screen.width - width) / 2;
 ypos = (screen.height - height) /2;
 var popWindow = window.open(link,"poppa",'left='+xpos+',top='+ypos+',toolbar=0,location=0,directories=0,scrollbars=0,status=0,menubar=0,resizable=0,width='+width+',height='+height);
}