I need to fire a php class from a javascript function.

code:

<input type="button" name="Submit" value="Submit" class="opinionbox" 
onclick="verifyControl('<?=$control_no?>')"/>

function verifyControl(rNo) {
 Cont_no=document.getElementById("ContNo").value;
  if(rNo==Cont_no) {
    frames['frame1'].print();
    showPage('payment');
  }
  else if(rNo!=Cont_no) {
    alert("invalid  control no");
  } 
}

i need to run the code

$data = $obj_com -> getSelectedData('tbl',
                      'control_no', $contno);
$control_no = $contno;
$obj_com -> recordPay('tbl',$contno);

inside the verifyControl() how can I do this?