var browserName = navigator.appName;
var browserVer = parseInt(navigator.appVersion);
var browserOs = navigator.platform;

// Browser,Ver dispatch
var nn3up = (browserName == "Netscape" && (browserVer >= 3 && browserVer <= 4));
var ie4up = (browserName.indexOf("Microsoft") >= 0 && browserVer >= 4);
var nn6 = (browserName == "Netscape" && browserVer == 5);


function linkStyleSheet(baseurl) {
    var  css = '';
    if (navigator.appVersion.indexOf("Mac") > 1) {
        css = 'mac_ie4up.css';
        if (nn6) {
            // MacNN6
            css = 'mac_nn6.css';
        }
        if (nn3up){
            // Mac NN Lower Ver.
            css = 'mac_nn3up.css';
        }

    } else {
        css = 'win_ie4up.css';
        if (nn6) {
            // WIN NN6
            css = 'win_nn6.css';
        }
        if (nn3up) {
            // WIN NN Lower Ver.
            css = 'win_nn3up.css';          
        }
    }

    document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="' + baseurl + css + '" />');
}