Post Parameters or Data with URL for JQGrid

Without Parameters:

jQuery(document).ready(function(){
  jQuery("#list").jqGrid({
    url:'list_xml/',
    datatype: 'xml',
    mtype: 'GET',....


With Parameters:

1. Query(document).ready(function(){ 
2. jQuery("#list").jqGrid({   
3. url:'list_xml/',   
4. datatype: 'xml',   
5. mtype: 'GET',
6. postData:{myname:myvar,,,},

Use like this.