if (navigator.appVersion.indexOf("Mac") != -1 ) {
    CURL = 'mac.css';
}
else if (navigator.appName.indexOf("Microsoft") != -1 ) {
    CURL = 'ie.css';
}
else if (navigator.appName.indexOf("Netscape") != -1 ) {
    CURL = 'ns.css';
}
else {
    CURL = 'main.css';
}

document.write('<link href="/formscss/' + CURL + '" type="text/css" rel="stylesheet">');

function isEmpty(s) {
    var tmp = "";

    for (i=0; i<s.length; i++) {
        if (s.charAt(i) != ' ') tmp += s.charAt(i);
    }

    if (tmp == "") return true;
    else return false;
}

function isInteger(s) {
    for (i=0; i<s.length; i++) {
        ch = s.charAt(i);
        if ((ch < '0' || ch > '9') && (ch != '-') && (ch != ' ')) {
            return false;
        }
    }
    return true;
}