function isIE9() {
    return navigator.appName.indexOf('Internet Explorer') !== -1 && navigator.appVersion.indexOf("MSIE 9") !== -1;
}

function isIE10() {
    return navigator.appName.indexOf('Internet Explorer') !== -1 && navigator.appVersion.indexOf("MSIE 10") !== -1;
}

function isOldIE() {
    return isIE9() || isIE10();
}

function isIE() {
    return ((navigator.appName === 'Microsoft Internet Explorer') || ((navigator.appName === 'Netscape') && (new RegExp('Trident/.*rv:([0-9]{1,}[.0-9]{0,})').exec(navigator.userAgent) !== null)));
}

// If the browser is Edge, returns the version number as a float, otherwise returns 0
function getEdgeVersion() {
    var match = /Edge\/(\d+[,.]\d+)/.exec(navigator.userAgent);
    if (match !== null) {
        return +match[1];
    }
    return 0;
}

function isFirefox() {
    return navigator.userAgent.toLowerCase().indexOf('firefox') !== -1;
}

function isSafari() {
    return navigator.userAgent.toLowerCase().indexOf('safari') !== -1;
}

function isChrome(){
    return window.chrome !== undefined
}