<!-- Finder den aktuelle browser --->
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: "OmniWeb",
            versionSearch: "OmniWeb/",
            identity: "OmniWeb"
        },
        {
            string: navigator.vendor,
            subString: "Apple",
            identity: "Safari"
        },
        {
            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: "Explorer",
            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.platform,
            subString: "Linux",
            identity: "Linux"
        }
    ]

};

<!-- Smider en POPUP ud med hvilken browser man bruger --->
//BrowserDetect.init();
//window.alert(BrowserDetect.browser + " " + BrowserDetect.version);

<!-- Henter CSS filen til den aktuelle browser --->
BrowserDetect.init();
if(BrowserDetect.browser == "Explorer"){document.write("<link href='css/style.css' rel='stylesheet' type='text/css' />")}
if(BrowserDetect.browser == "Firefox"){document.write("<link href='css/stylefirefox.css' rel='stylesheet' type='text/css' />")}

if(BrowserDetect.browser == "OmniWeb"){document.write("<link href='css/style.css' rel='stylesheet' type='text/css' />")}
if(BrowserDetect.browser == "Safari"){document.write("<link href='css/style.css' rel='stylesheet' type='text/css' />")}
if(BrowserDetect.browser == "Opera"){document.write("<link href='css/style.css' rel='stylesheet' type='text/css' />")}
if(BrowserDetect.browser == "iCab"){document.write("<link href='css/style.css' rel='stylesheet' type='text/css' />")}
if(BrowserDetect.browser == "Konqueror"){document.write("<link href='css/style.css' rel='stylesheet' type='text/css' />")}
if(BrowserDetect.browser == "Camino"){document.write("<link href='css/style.css' rel='stylesheet' type='text/css' />")}
if(BrowserDetect.browser == "Netscape"){document.write("<link href='css/style.css' rel='stylesheet' type='text/css' />")}
if(BrowserDetect.browser == "Mozilla"){document.write("<link href='css/style.css' rel='stylesheet' type='text/css' />")}