Reference Error - cfgrid.js

Here is the code...

    <script type="text/javascript">

    var dataproxy = new dataproxy();

    dataproxy.setCallbackHandler(handleResult);

    function handleResult(response)

    {

        alert(response);

    }

    // add the 2 custom buttons to the toolbar

    function init(){

     grid = ColdFusion.Grid.getGridObject("approveUsergrid");

     var gridHead = grid.getView().getHeaderPanel(true);

     var tbar = new Ext.Toolbar(gridHead);

     tbar.addButton({text:"Add User", handler:onAdd });

     tbar.addSeparator();

     tbar.addButton({ text:"Delete User", handler:onDelete });

    }

    function onAdd(button,event){

        ColdFusion.Window.show('addUserWin');

    }

    function onDelete(){

        ColdFusion.Window.show('deleteUserWin');

    }

    function addUser()

    {

        //send data to CFC to add artist, the result will be handled by handleResult function above

        var f = document.frmUser;

        dataproxy.addNewUser(

            f.txtFirstName.value

            ,f.txtLastName.value

            ,f.txtEmail.value

        );

        ColdFusion.Window.hide('addUserWin');

        grid.refresh();

    }

    function deleteUser(s)

    {

        // if user choose to delete, then send the CFC call, otherwise just sit back!

        if (s == 'yes')

        {

        var grid = ColdFusion.Grid.getGridObject("approveUsergrid");

        var record = grid.getSelections();

        // remember, CF makes column names to all UPPERCASE, so dont forget to do that

        dataproxy.deleteUser(record[0].data.ID);

        }

        ColdFusion.Window.hide('deleteUserWin');

        grid.refresh();

    }

    </script>

<cfset args = structNew()>

<cfset args.name = "approveUsergrid">

<cfset args.format = "html">

<cfset args.bindOnLoad = "true">

<cfset args.bind = "cfc:cfc.users.approveUserlist({cfgridpage},{cfgridpagesize},{cfgridsortcolumn},{cfgridsortdirection})">

<cfset args.stripeRows = true>

<cfset args.selectColor = "##E3A20D">

<cfset args.selectmode = "edit">

<cfset args.align = "left">

<cfset args.autowidth = "yes">

<cfset args.bgColor = "##FFFFFF">

<cfset args.colHeaderAlign="left">

<cfset args.colHeaderBold = "yes">

<cfset args.colHeaderFont = "Arial, Helvetica, sans-serif">

<cfset args.colHeaderFontSize = "1.8em">

<cfset args.colHeaderTextColor = "##354914">

<cfset args.font = "Arial, Helvetica, sans-serif">

<cfset args.fontsize = "1.4em">

<cfset args.gridDataAlign = "left">

<cfset args.gridLines = "yes">

<cfset args.preservePageOnSort = "yes">

<cfset args.rowHeight = "100">

<cfset args.selectOnLoad="no">

<cfset args.sort = "yes">

<cfset args.sortAscendingButton = "Sort Ascending">

<cfset args.sortDescendingButton = "Sort Descending">

<cfset args.stripeRowColor = "##658C26">

<cfset args.target = "_self">

<cfset args.textColor = "##333333">

<cfset args.width = "600px">

<cfset args.onchange = "cfc:cfc.users.approveUser({cfgridaction},{cfgridrow},{cfgridchanged})">

<cfform>

<cfgrid attributeCollection="#args#">

          <cfgridcolumn name="ID" display="false">

          <cfgridcolumn name="FIRSTNAME" header="First Name">

          <cfgridcolumn name="LASTNAME" header="Last Name">

          <cfgridcolumn name="EMAIL" header="Email">

          <cfgridcolumn name="DATECREATED" header="Date Created" mask="mm/dd/yyyy" type="date">

</cfgrid>

</cfform>

<cfwindow width="150" height="150" name="deleteUserWin" modal="true" resizable="false" title="Delete User?"

bodyStyle="font-family: verdana; color: ##000000;font-size:15px;font-weight:bold;"

       headerStyle="font-family: verdana; background-color: black; color: white">

          <div style="margin-left:5px;margin-top:5px;">

          Please Confirm this action.

          <input type="button" value="yes, surely!" onClick="deleteUser('yes')">

          <input type="button" value="no, please! " onClick="deleteUser('no')">

          <br/>

</cfwindow>

<cfwindow name="addUserWin" modal="true" resizable="false" title="Add New User" bodyStyle="font-size:10px;font-family: verdana; color: ##ff0000;"

       headerStyle="font-family: verdana; background-color: black; color: white">

          <form name="frmUser" style="font-size:10px;">

                    <table width="100%">

                              <tr>

                                        <td>Firstname</td>

                                        <td><input type="text" name="txtFirstName" value="dummy"></td>

                              </tr>

                              <tr>

                                        <td>Lastname</td>

                                        <td><input type="text" name="txtLastName"  value="dummy"></td>

                              </tr>

                              <tr>

                                        <td>Email</td>

                                        <td><input type="text" name="txtEmail"  value="dummy"></td>

                              </tr>

                              <tr>

                                        <td colspan="2"><input type="button" value="Add User" onClick="javascript:addUser();"></td>

                              </tr>

          </form>

</cfwindow>

<cfset ajaxOnLoad("init")>