jQuery Grid Plugin - jqGrid

I'm having a problem with handling the server response from an edit event.  Ideally, what I'd like to have happen is that on a successful transaction, the edit form simply closes and the grid is updated; if an error occurs during the update, the edit form should stay open, and the error message appear on the form (e.g. bottominfo).  However, I'd settle for leaving the form open regardless of the result, and print the result message either way.  I've got the form working as far as updating the database, but I can't find where the 'afterSubmit' function is sending the result array.  None of the examples in the demo pack illustrate this feature, and I haven't been able to find anything helpful in the forums.

Here's my grid so far:

    $("#list").jqGrid({
        url:'data.php',
        datatype: "json",
        mtype: "POST",
        colNames:[...],
        colModel:[...],
        editurl:"data_edit.php"
    });
    $("#editdata").click(function(){
        var id = jQuery("#list").jqGrid('getGridParam','selrow');
        var options = {
            bottominfo: "",
            modal: true,reloadAfterSubmit:true, closeOnEscape:true,closeAfterEdit:false,
            afterSubmit: function(response,postdata){ return GetResponseData(response); }
        };
        if(id != null ) jQuery("#list").jqGrid('editGridRow',id,options);
        else alert("Please Select Row");
    });
    function GetResponseData (resp) {
        var json=resp.responseText;  //format is {errno:(int),errmsg:"",query:""}
        var result=eval("("+json+")");
        return [result.errno,result.error,""];
    }

I know that the value of the array returned from the 'afterSubmit' event needs to be the assigned to 'bottominfo' property, something along the lines of:

    var z = ???; // array sent from afterSubmit
    $('.bottominfo').text("ERROR [" + z.errno + "] " + z.errmsg);

but I can't fingure out where this needs to go.

Another problem I've just realized is that there is no 'bottominfo' property associated with the 'delGridRow' method.  I suppose I could overwrite the table row which has the 'delmsg' class, which takes us right back to the problem of accessing the 'afterSubmit' array.

HELP!!!

Thanks,
Mitch