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