if (navigator.appVersion.indexOf("Mac") != -1) {
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    else if (navigator.userAgent.indexOf("Firefox") != -1) {
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    else {
        document.write("<link href=\"StyleSheet_safari.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
    }
}
else if (navigator.userAgent.indexOf("MSIE") != -1) {
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    }
    document.write("<link href=\"/portals/_default/skins/frontpage/StyleSheet_ie.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
    /*else if (parseFloat(navigator.appVersion.split("MSIE")[1]) <= 7) {
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}
else if (navigator.userAgent.indexOf("Firefox") != -1) {
    document.write("<link href=\"/portals/_default/skins/frontpage/StyleSheet_ff.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
}
else if (navigator.userAgent.indexOf("Safari") != -1) {
    document.write("<link href=\"/portals/_default/skins/frontpage/StyleSheet_safari.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
}