1. First all, add "toppager:true" as an user defined parameter in your code.

$dg->ud_params = 'toppager:true,';

2. Add the following javascript before the ending BODY tag. Make sure to replace "#TABLENAME" with the database table name used for the grid.

jQuery(document).ready(function($){ 
    jQuery('#TABLENAME_pager1').insertBefore('#TABLENAME_toppager_left');      jQuery("#TABLENAME_pager1_center").remove();
});