<script language="javascript" type="text/javascript">
document.onkeydown = function(e)
{
    var ev = (window.event)? window.event: e;
    //回车捕获焦点
    if (ev.keyCode == 13)
    {
        document.getElementById("<%= ibSearch.ClientID %>").click();
        ev.keyCode = 0;
        ev.returnValue = false;
    }
}

    </script>