phpGrid get cell value in javascript

Code snippet for validating a phpGrid column in javascript of a multi-select Grid.
For example in order select orders from grid to dispatch,
one would validate the order status before dispatching
<script type="text/javascript">
function ShowSelectedRows()
{
var rowid = getSelRows();
var grid = jQuery('#gridname');
var orderStatus = grid.getCell(rowid, 'orderStatus');
alert(orderStatus);
}