<!-- POP UP WINDOW ------------------------------------------>
function popup(mylink, windowname)
{
if (! window.focus)return true;
var href;
if (typeof(mylink) == 'string')
   href=mylink;
else
   href=mylink.href;

if (windowname == 1)
 window.open(href, windowname, 'width=578,height=450,scrollbars=no');
else
window.open(href, windowname, 'width=430,height=680,scrollbars=no');

return false;
}
<!-- END POP UP WINDOW ------------------------------------------>