function popup(mylink, windowname)
{
if (! window.focus)return true;
var href;
if (typeof(mylink) == 'string')
href=mylink;
else
href=mylink.href;
window.open(href, windowname, 
   'width=640,height=500,scrollbars=no,dependent=yes,left=100,top=40');
return false;
}