Código PHP:
<html>
<head>
<SCRIPT LANGUAGE="JavaScript">
<!--
function popUp(URL) {
window.open(URL, 'pops', 'toolbar=no,scrollbars=no,location=no,statusbar=no,menubar=no,resizable=no,width=800,height=600');
}
// -->
</script>
</head>
<body>
<A HREF="javascript:popUp('http://google.com.mx')">ABRIR !</A>
</body>
</html>