<script language="javascript" type="text/javascript"> function setCheckBox(frm) { var objCheckBoxItem = document.getElementsByTagName("input") if (frm.GridView_ctl01_chkAll.checked) { for (var i = 0; i < objCheckBoxItem.length; i++) if (objCheckBoxItem[i].type == "checkbox") objCheckBoxItem[i].checked = true; } else { for (var i = 0; i < objCheckBoxItem.length; i++) if (objCheckBoxItem[i].type == "checkbox") objCheckBoxItem[i].checked = false; } } </script>