jQuery Grid Plugin - jqGrid

From this demo i am not able to make it work? What i should do to have this module work?

Latest demo as following:

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This example show navigator.
See below for all available options.
Note: The data is not saved to the server

Description
This method uses colModel and editurl parameters from jqGrid
Calling: jQuery("#grid_id").navGrid(selector,options,pEdit,pAdd,pDel,pSearch );
Java Scrpt code
jQuery("#navgrid").jqGrid({ url:'editing.php?q=1', datatype: "xml",
colNames:['Inv No','Date', 'Client',
'Amount','Tax','Total','Closed','Ship via','Notes'], colModel:[
{name:'id',index:'id',
width:55,editable:false,editoptions:{readonly:true,size:10}},
{name:'invdate',index:'invdate',
width:80,editable:true,editoptions:{size:10}},
{name:'name',index:'name',
width:90,editable:true,editoptions:{size:25}},
{name:'amount',index:'amount', width:60,
align:"right",editable:true,editoptions:{size:10}},
{name:'tax',index:'tax', width:60,
align:"right",editable:true,editoptions:{size:10}},
{name:'total',index:'total',
width:60,align:"right",editable:true,editoptions:{size:10}},
{name:'closed',index:'closed',width:55,align:'center',editable:true,edittype:"checkbox",editoptions:{value:"Yes:No"}},

{name:'ship_via',index:'ship_via',width:70, editable:
true,edittype:"select",editoptions:{value:"FE:FedEx;TN:TNT"}},
{name:'note',index:'note', width:100, sortable:false,editable:
true,edittype:"textarea", editoptions:{rows:"2",cols:"20"}} ],
rowNum:10, rowList:[10,20,30], imgpath: gridimgpath, pager:
jQuery('#pagernav'), sortname: 'id', viewrecords: true, sortorder:
"desc", caption:"Navigator Example", editurl:"someurl.php", height:210
}).navGrid('#pagernav',
{}, //options
{height:280,reloadAfterSubmit:false}, // edit options
{height:280,reloadAfterSubmit:false}, // add options
{reloadAfterSubmit:false}, // del options
{} // search options
);