function EnterSubmit(buttonid, e) {

    var button = document.getElementById(buttonid);
    var keynum;

    if (window.event) // IE
    {
        keynum = e.keyCode;
    }
    else if (e.which) // Netscape/Firefox/Opera
    {
        keynum = e.which;
    }

    if (keynum == 13) {

        if (e.returnValue) {
            e.returnValue = false;
        }

        if (e.cancel) {
            e.cancel = true;
        }

        if (e.cancelBubble) {
            e.cancelBubble = true;
        }

        if (button.tagName == "A") {
            location.href = button.href;
        }
        else {
            button.click();
        }

        return false;
    }

    return true;
}