function DetectBrowser()
    {
    var agent = window.navigator.userAgent.toLowerCase();

    if (agent.indexOf("msie") != -1)
    return "MSIE";

    if (agent.indexOf("firefox") != -1)
    return "Firefox";

    return "Unknown";
    }


    function PostbackDefaultButton(clientButtonId, e)
    {
        var ev;
        var browser = DmsTextBoxDetectBrowser();

        if (browser == "MSIE") {
            if (window.event.keyCode == 13) {
                window.event.returnValue = false;
                window.event.cancel = true;
            }

            ev = window.event;
        }
        else {
            ev = e;
        }

        if (e.keyCode == 13) {
            //INFO: With a validator on the page, this method does not work in IE!
            //__doPostBack(clientButtonId, "");

            //INFO: The WebForm_DoPostBackWithOptions method is called on button click, but this doesn't work either...
            //WebForm_PostBackOptions(eventTarget, eventArgument, validation, validationGroup, actionUrl, trackFocus, clientSubmit)
            //WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(clientButtonId, "", true, "", "", false, false))

            // So, we simulate the button click		
            var button = document.getElementById(clientButtonId);

            if (button.click) {
                button.click();
                return false;
            }
        }

        return true;

    }