var nVer = navigator.appVersion;
var nAgt = navigator.userAgent;
var browserName = '';
var fullVersion = 0;
var majorVersion = 0;
var UseSimpleVersion = 0;

function chkBrowser() {
    // In Internet Explorer, the true version is after "MSIE" in userAgent
    if ((verOffset = nAgt.indexOf("MSIE")) != -1) {
        browserName = "Microsoft Internet Explorer";
        fullVersion = parseFloat(nAgt.substring(verOffset + 5));
        majorVersion = parseInt('' + fullVersion);
    }

    // In Opera, the true version is after "Opera"
    else if ((verOffset = nAgt.indexOf("Opera")) != -1) {
        browserName = "Opera";
        fullVersion = parseFloat(nAgt.substring(verOffset + 6));
        majorVersion = parseInt('' + fullVersion);
    }

    // In Firefox, the true version is after "Firefox"
    else if ((verOffset = nAgt.indexOf("Firefox")) != -1) {
        browserName = "Firefox";
        fullVersion = parseFloat(nAgt.substring(verOffset + 8));
        majorVersion = parseInt('' + fullVersion);
    }

    // In most other browsers, "name/version" is at the end of userAgent
    else if ((nameOffset = nAgt.lastIndexOf(' ') + 1) < (verOffset = nAgt.lastIndexOf('/'))) {
        browserName = nAgt.substring(nameOffset, verOffset);
        fullVersion = parseFloat(nAgt.substring(verOffset + 1));
        if (!isNaN(fullVersion)) majorVersion = parseInt('' + fullVersion);
        else { fullVersion = 0; majorVersion = 0; }
    }

    // Finally, if no name and/or no version detected from userAgent...
    if (browserName.toLowerCase() == browserName.toUpperCase()
			|| fullVersion == 0 || majorVersion == 0) {
        browserName = navigator.appName;
        fullVersion = parseFloat(nVer);
        majorVersion = parseInt(nVer);
    }

    if (browserName != 'Microsoft Internet Explorer') {
        alert('請使用Microsoft Internet Explorer瀏覽器版本 6.0 以上');
    }
    else if (browserName == 'Microsoft Internet Explorer' & majorVersion < 4) {
        alert('請使用Microsoft Internet Explorer瀏覽器版本 6.0 以上');
    }
}

//檢查是否用簡易版本
function chkUseSimpleVersion() {
    if (nAgt.indexOf("iPad") != -1 || nAgt.indexOf("iPhone") != -1) {
    //if (nAgt.indexOf("Safari") != -1) {
        UseSimpleVersion = 1;
    }
    else {
        UseSimpleVersion = 0;
    }
}

chkUseSimpleVersion();