<script type="text/javascript"> function banBackSpace(e) { var ev = e || window.event; var obj = ev.target || ev.srcElement; var t = obj.type || obj.getAttribute('type') || obj.localName; var vReadOnly = obj.getAttribute('readonly'); var vEnabled = obj.getAttribute('enabled'); var contenteditable = obj.getAttribute('contenteditable'); vReadOnly = (vReadOnly == null) ? false : vReadOnly; vEnabled = (vEnabled == null) ? true : vEnabled; var flag1 = (ev.keyCode == 8 && (t == "password" || t == "text" || t == "textarea" || t == "div") && (contenteditable == true || vReadOnly == true || vEnabled != true)) ? true : false; var flag2 = (ev.keyCode == 8 && t != "password" && t != "text" && t != "textarea" && (t != "div" && contenteditable != true)) ? true : false; if (flag2) return false; if (flag1) return false; } document.onkeydown = banBackSpace; </script>