jQuery Grid Plugin - jqGrid

Hi guys:

I'm new to jqGrid, I meet a problem when I'm using it. When I try to use navigation bar like

jQuery("#list").navGrid('#pager',{view:true, del:false},
{}, // use default settings for edit
{}, // use default settings for add
{},  // 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*/
);

it throws an exception and I've been told that "jqGrid no such method" even after I add the $.jgrid.no_legacy_api = true. Can anyone help me to figure out what's going on and why?

Thanks in advance!