(function() 
   {

        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<data.length;i++) 
                {
                    var dataString = data[i].string;
                    var dataProp = data[i].prop;
                    this.versionSearchString = data[i].versionSearch || data[i].identity;
                    if (dataString) 
                    {
                        if (dataString.indexOf(data[i].subString) != -1)
                            return data[i].identity;
                    }
                    else if (dataProp)
                        return data[i].identity;
                }
            },
            searchVersion: function (dataString) 
            {
                var index = dataString.indexOf(this.versionSearchString);
                if (index == -1) return;
                return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
            },
            dataBrowser: 
            [
                {
                    string: navigator.userAgent,
                    subString: "Chrome",
                    identity: "Chrome"
                },
                {   string: navigator.userAgent,
                    subString: "OmniWeb",
                    versionSearch: "OmniWeb/",
                    identity: "OmniWeb"
                },
                {
                    string: navigator.vendor,
                    subString: "Apple",
                    identity: "Safari",
                    versionSearch: "Version"
                },
                {
                    prop: window.opera,
                    identity: "Opera"
                },
                {
                    string: navigator.vendor,
                    subString: "iCab",
                    identity: "iCab"
                },
                {
                    string: navigator.vendor,
                    subString: "KDE",
                    identity: "Konqueror"
                },
                {
                    string: navigator.userAgent,
                    subString: "Firefox",
                    identity: "Firefox"
                },
                {
                    string: navigator.vendor,
                    subString: "Camino",
                    identity: "Camino"
                },
                {       // for newer Netscapes (6+)
                    string: navigator.userAgent,
                    subString: "Netscape",
                    identity: "Netscape"
                },
                {
                    string: navigator.userAgent,
                    subString: "MSIE",
                    identity: "IE",
                    versionSearch: "MSIE"
                },
                {
                    string: navigator.userAgent,
                    subString: "Gecko",
                    identity: "Mozilla",
                    versionSearch: "rv"
                },
                {       // for older Netscapes (4-)
                    string: navigator.userAgent,
                    subString: "Mozilla",
                    identity: "Netscape",
                    versionSearch: "Mozilla"
                }
            ],
            dataOS : 
            [
                {
                    string: navigator.platform,
                    subString: "Win",
                    identity: "Windows"
                },
                {
                    string: navigator.platform,
                    subString: "Mac",
                    identity: "Mac"
                },
                {
                    string: navigator.userAgent,
                    subString: "iPhone",
                    identity: "iPhone/iPod"
                },
                {
                    string: navigator.platform,
                    subString: "Linux",
                    identity: "Linux"
                }
            ]
        
        };

        BrowserDetect.init();

        window.$.client = 
        { 
            OS : BrowserDetect.OS , 
            Browser : BrowserDetect.browser , 
            Version : BrowserDetect.version
        };

    })();

JQuery dependent snippet that will detect OS, Browser and Version

Browser/OS Detection

browser

jQuery