ใช้ function ส่ง mail ให้ผู้ที่ได้รับ email click แล้วขึ้น popup

$to = "$_POST[username]";
$subject="Fanpage";
$msg= "
<a href=\"javascript:void(0)\" onclick=\"window.open
	('http://www.facebook.com','popup','toolbar=0,scrollbars=1,location=0,directories=0,width=500,height=500')\">Click >>></a>";

$headers = "From: admin\n";
$headers.= "MIME-Version: 1.0\n"; 
$headers.= "Content-Type: text/html; charset=utf-8\n"; 


mail("$to","$subject","$msg","$headers");