function getExplorer() {
    var browserName = "";

    var ua = navigator.userAgent.toLowerCase(); 
    if (ua.indexOf("opera") != -1) {
        browserName = "opera";
    } else if (ua.indexOf("msie") != -1) {
        browserName = "ie";
    } else if (ua.indexOf("chrome") != -1) {
        browserName = "chrome";
    } else if (ua.indexOf("safari") != -1) {
        browserName = "safari";
    } else if (ua.indexOf("mozilla") != -1) {
        if (ua.indexOf("firefox") != -1) {
            browserName = "firefox";
        } else {
            browserName = "mozilla";
        }
    }

    return browserName;
}