不返回确切值

email value is passed from one page to another through the following

  $.ajax({
type:'post',
    url:'email.php',
    data:{email: email},
    success:function(msg){
    alert(msg);         
    }
 });

$s show the email id.I echoed $echeck and $echk for testing. $echk doesn't return 1.

  $s=$_POST['email'];
  echo $echeck="select email from register where email=".$_POST['email'];
  echo $echk=mysql_query($echeck);
  echo $ecount=mysql_num_rows($echk);