What is the Best way to do Browser Detection in Javascript?

Question

In one of my Web Development classes we where asked to create a script that detects NE4,NE6+,IE4,IE6+ Browsers that display a compatable CSS script for each browser.

Answer 1

The standard way to detect what browser is used is to check the user agent supplied.

var BrowserDetect = {
    init: function () {
        this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
        this.version = this.searchVersion(navigator.userAgent)
            || this.searchVersion(navigator.appVersion)
            || "an unknown version";
        this.OS = this.searchString(this.dataOS) || "an unknown OS";
    },
    searchString: function (data) {
        for (var i=0;i

http://www.quirksmode.org/js/detect.html