function popup(mylink, windowname, height)
 {
 if (! window.focus)return true;
 if (height==null){
 height=332;
 }
 var href;
 if (typeof(mylink) == 'string')
 href=mylink;
 else
 href=mylink.href; 
 window.open(href, windowname, 'width=318,height= ' + height + ',left=150,top=200');
 return false;
}