var browser =""
var agt=navigator.userAgent.toLowerCase();
var is_vr = parseInt(navigator.appVersion);

var is_nav  = (agt.indexOf('mozilla')!=-1);
var is_nav4 = (is_nav && (is_vr == 4));

var is_ie   = (agt.indexOf("msie") != -1);
var is_ie4  = (is_ie && (is_vr == 4) && (agt.indexOf("msie 5.0")==-1) );
var is_ie4up  = (is_ie  && (is_vr >= 4) && (is_vr < 5));
var is_ie5up  = (is_ie  && (agt.indexOf("msie 5.0")!=-1));

var is_mac = (navigator.appVersion.indexOf("Mac") != -1);

if (is_mac) {
    if (is_ie5up) {
    document.write('<LINK REL="stylesheet" REV="stylesheet" TYPE="text/css" HREF="library/ie.css">')
    browser = "ie5up"
    }
    else {
    document.write('<LINK REL="stylesheet" REV="stylesheet" TYPE="text/css" HREF="library/nn4mac.css">')
    browser = "mac"
    }
}
else if (is_ie) {
    document.write('<LINK REL="stylesheet" REV="stylesheet" TYPE="text/css" HREF="library/ie.css">')
    browser = "ie"
}
else if (is_nav) {
    if (is_nav4) {
    document.write('<LINK REL="stylesheet" REV="stylesheet" TYPE="text/css" HREF="library/nn4.css">')
    browser = "nav4"
    }
    else {
    document.write('<LINK REL="stylesheet" REV="stylesheet" TYPE="text/css" HREF="library/ie.css">')
    browser = "nav5up"
    }
}

function ShowBrowser() { document.write('Browser: '+browser+'<br>'); }