function check_all(checkall){
	
	var id_chk = new String();
	var dg = document.frm_datagrid;
	
	for (counter = 0; counter < dg.length; counter++){
			id_chk = dg[counter].id;
			chk = dg[counter];
		if (id_chk=='chk[]'){
			chk.checked=checkall.checked;
		}
			
	}	
}