让文本框在ie中敲回车起作用、火狐中敲回车无作用的代码

<script type="text/javascript">    function ButtonNo()
    {
        if(document.all)
        {
            event.returnValue=false;
        }
        else
        {
            event.preventDefault();
        }
     }
</script>

<asp:TextBox ID="Texx_Name"  runat="server"  onkeypress="if(event.keyCode==13){ButtonNo();return false;}"></asp:TextBox>

重点：onkeypress="if(event.keyCode==13){ButtonNo();return false;}"