按回车提交页面

<script text/type="javascript">
function document.onkeydown()
{
 var e = event.srcElement;
 var k = event.keyCode;
 if (k == 13 && e.type != "textarea")
 {
  var sbmt = document.getElementById("<%= cmdLogin.ClientID %>");
  sbmt.click();
  event.cancelBubble = true;
  event.returnValue = false;
 }
}
</script>