jQuery Grid Plugin - jqGrid

Hello - I am working with my first jqgrid and have read through the documentation pretty extensively. However, I seem to be having some trouble with trying to get the Multi Search Feature to work. 

Here is the code I have for my javascript currently:

<script src="custom/include/javascript/jquery-1.2.6.js" type="text/javascript"></script>

<link rel="stylesheet" type="text/css" media="screen" href="cfm_framework/include/javascript/common/jqgrid/themes/steel/grid.css" />

<script src="cfm_framework/include/javascript/common/jqgrid/jquery.jqGrid.js" type="text/javascript"></script>

<script type="text/javascript" language="javascript">

var $j = jQuery.noConflict();

$j(document).ready(function() {

$j("#opp_grid").jqGrid({

   url:'CFM_HandleAjaxCall.php?controller=Opportunities&method=list_for_new_grid',

   datatype: 'xml',

   mtype: 'GET',

   colNames:['','Date Entered', 'Last Name','First Name','Opportunity Name','Stock #','Contact Type','Sales Stage','Assigned User'],

   colModel :[ 

     {name:'id', index:'id', width:100}, 

     {name:'date_entered', index:'date_entered', width:100 ,formatter:'date'}, 

     {name:'last_name', index:'last_name', width:80, align:'right'}, 

     {name:'first_name', index:'first_name', width:80, align:'left'}, 

     {name:'name', index:'name', width:160}, 

     {name:'Stock_Number', index:'Stock_Number', width:50, sortable:false},

 {name:'contacttype_c', index:'contacttype_c', width:80, align:'right'}, 

 {name:'sales_stage', index:'sales_stage', width:80, align:'right'}, 

 {name:'assigned_user_id', index:'assigned_user_id', width:80, align:'right'}

],

   pager: $j('#pager'),

   rowNum:10,

   rowList:[10,20,30],

   sortname: 'id',

   sortorder: "desc",

   viewrecords: true,

toolbar : [true,"top"],

   imgpath: 'cfm_framework/include/javascript/common/jqgrid/themes/steel/images',

   caption: 'Opportunities List'

 });

$j("#t_opp_grid").height(25).hide().filterGrid("opp_grid",{gridModel:true,gridToolbar:true});

$j("#sg_date_entered").datepicker({dateFormat:"mm/dd/yyyy"});

$j("#opp_grid").navGrid('#pager',{edit:false,add:false,del:false,search:false,refresh:false})

.navButtonAdd("#pager",{caption:"Search",title:"Toggle Search",buttonimg:gridimgpath+'/find.gif',

onClickButton:function(){ 

if($j("#t_opp_grid").css("display")=="none") {

$j("#t_opp_grid").css("display","");

} else {

$j("#t_opp_grid").css("display","none");

}

} 

});

});

Here is what is on my html page:

<table id="opp_grid" class="scroll"></table> 
<div id="pager" class="scroll" style="text-align:center;">

My table is showing up fine. However, there is no search button at all anywhere. 

Any help or ideas? 

Thanks!