jQuery Grid Plugin - jqGrid

Yo Guys….

Thanks for the plugin… it really ROCKS!!!!!!!!!!!!!!!!!!!

jQuery(”#tmpTable”).setGridParam({postData: { _search:true, searchField:'name', searchOper:'cn', searchStr:companyName},page:1}).trigger(”reloadGrid”);

got some problem right now..  i am using jqgrid 3.5.3

i am doing a simple search form, post data for the fields (searchField, searchOper, searchStr) is correct except to '_search' which always returning false… is jqgrid overiding it, and what could be the cause?

TIA

 jQuery(”#tmpTable”).jqGrid({
    url:'tmpTable.php',
    width:900,
    datatype: 'json',
    //colNames:['Company Name'],
    colModel :[{       
        name:'name'
        ,index:'name'
        ,width:100           
    }],
    pager: jQuery('#tmpPager'),
    rowNum:10,
    rowList:[10,20,30],
    sortname: 'name',
    sortorder: “asc”,
    multiselect: false,
    viewrecords: true,
    imgpath: 'themes/basic/images',   
  }).navGrid('#tmpPager',              
        {add:false,edit:false,del:false,search:false}
  );
});/* end of on ready event */

jQuery(”#tmpTable”).setGridParam({postData: { _search:true, searchField:'name', searchOper:'cn', searchStr:'test'},page:1}).trigger(”reloadGrid”);

logs from firebug….