jQuery Grid Plugin - jqGrid

<script type="text/javascript">
jQuery(document).ready(function () {
  jQuery("#listcust").jqGrid ( {
    url:'xml/customers_xml.php',
    datatype: "xml",
    mtype: 'GET',
    colNames:['ΚΔΩ.','ΟΝΟΜΑΤΕΠΩΝΥΜΟ','ΤΗΛΕΦΩΝΟ','E-MAIL','ΔΙΕΥΘΥΝΣΗ','ΣΗΜΕΙΩΣΕΙΣ'],
    colModel :[
      {name:'custid', index:'custid', width:90, editable:true,editoptions:{size:25}},
      {name:'custname', index:'custname', width:90, editable:true,editoptions:{size:25}},
      {name:'custphone', index:'custphone', width:90, editable:true,editoptions:{size:25}},
      {name:'custmail', index:'custmail', width:90, editable:true,editoptions:{size:25}},
      {name:'custaddress', index:'custaddress', width:90, editable:true,editoptions:{size:25}},
      {name:'custnotes', index:'custnotes', width:190, editable:true,editoptions:{size:25}}
    ],
    pager: jQuery('#pager1'),
    rowNum:20,
    rowList:[10,20,30],
    sortname: 'custid',
    sortorder: 'desc',
    viewrecords: true,
    autowidth: true,
    height: 440,
    loadtext: "ΦÏŒρτωμα Δεδομένων...",
    editurl:"xml/edit_customers_xml.php",
    addurl:"xml/add_customers_xml.php",
    caption: 'ΛΙΣΤΑ ΠΕΛΑΤΩΝ'
  })
  .navGrid('#pager1',{view:true, del:true, clearAfterAdd:true, search: true,add:true,closeAfterEdit:true},
{height:280,reloadAfterSubmit:true},
{height:280,reloadAfterSubmit:true},
{height:280,reloadAfterSubmit:false},  // delete instead that del:false we need this
{multipleSearch : true}, // enable the advanced searching
{closeOnEscape:true} /* allow the view dialog to be closed when user press ESC key*/
);

//  $("#bedata").click(function(){
//      var gr = jQuery("#listcust").getGridParam('selrow');
//      if( gr != null ) jQuery("#listcust").editGridRow(gr,{height:280,reloadAfterSubmit:false});
//      else alert("ΠαρακαλÏŽ επιλέξτε κάποια εγγραφή πρÏŽτα");
//    });
 
});

</script>

<?php
include ("../includes/db.php");

if ($_POST[custid]=="") {

//insert new row sql code

}
else {

//edit row sql code

}

  ?>