popup in oracle apex

<script language="JavaScript" type="text/javascript">
  function callMyPopup (formItem1,formItem2,formItem3) {
    var formVal1 = document.getElementById(formItem1).value;
    var formVal2 = document.getElementById(formItem2).value;
    var formVal3 = document.getElementById(formItem3).value;
    var url;
  url = 'f?p=&APP_ID.:2:&APP_SESSION.::::P2_ENAME,P2_JOB,P2_SAL:' + formVal1 + ',' + formVal2 + ',' + formVal3 ;
  w = open(url,"winLov","Scrollbars=1,resizable=1,width=800,height=600");
  if (w.opener == null)
  w.opener = self;
  w.focus();
  }
</script>