jQuery Grid Plugin - jqGrid

I waht to use cell edit, I've included all the scripts but when I press click on the cell, nothing is happend.

<script type="text/javascript">
jQuery(document).ready(function(){
    jQuery("#list").jqGrid({
        height: 440,
        url:'db2xml/utilizatori.php?<?=$queryString;?>',
        datatype: 'xml',
        mtype: 'GET',
        cellsubmit: 'remote',
        cellurl: 'update.php',
        colNames:['Nume','Username', 'Activ', 'Tip', 'Adresa', 'Judet', 'Telefon 1', 'Email', 'Last login', 'Actiuni'],
        colModel :[
            {name:'nume', index:'nume', width:130},
            {name:'username', index:'username', editable:true, width:100},
            {name:'flag_activ', index:'flag_activ', width:35, align:'center', editable:true, edittype:'checkbox', editoptions: {value:'y:n'}},
            {name:'id_tip_utilizatori', index:'id_tip_utilizatori', width:100},
            {name:'adresa', index:'adresa', width:250},
            {name:'id_judete', index:'id_judete', width:100},
            {name:'telefon1', index:'telefon1', width:100, align:'right'},
            {name:'email1', index:'email1', width:180},
            {name:'data_last_login', index:'data_last_login', width:130, align:'center'},
            {width:80, sortable:false},
            ],
        pager: jQuery('#pager'),
        rowNum:20,
        rowList:[10,20,30],
        sortname: 'data_last_login',
        sortorder: "desc",
        viewrecords: true,
        multiselect: true,
        multiboxonly: true,
        imgpath: 'jqgrid/themes/sand/images',
        editurl: "update.php",
        caption: '<strong>Utilizatori</strong>'
        }).navGrid('#pager',{add:false,del:false,edit:false,position:"left"});
    });
</script>

Hwo can help me with a sugestion? Thanks..