function clickButton(e, buttonid) {
    var evt = e ? e : window.event;
    var bt = document.getElementById(buttonid);
    
    if (bt){
        if (evt.keyCode == 13){
        bt.click();
        return false;
        }
    }
}

function detectIE6() {
    var browser = navigator.appName;
    if (browser == "Microsoft Internet Explorer") {
        var b_version = navigator.appVersion;
        var re = /\MSIE\s+(\d\.\d\b)/;
        var res = b_version.match(re);
        if (res[1] <= 6) {
            return true;
        }
    }
    return false;
}