function escapeString(str) {
    var strObj = new String(str);
    strObj = strObj.replace(/\</g, '%3C');
    strObj = strObj.replace(/\>/g, '%3E');
    strObj = strObj.replace(/\"/g, '%22');
    strObj = strObj.replace(/\'/g, '%27');
    return strObj;
}
function writeAccTag(accName) {
    accName = accName.replace(/[^0-9A-Za-z]/, '');
    var accUrl   = '/acc/'     + escapeString(accName)           + '/acclog.cgi?'
                 + 'referrer=' + escapeString(document.referrer) + '&'
                 + 'width='    + escapeString(screen.width)      + '&'
                 + 'height='   + escapeString(screen.height)     + '&'
                 + 'color='    + escapeString(screen.colorDepth);
    document.write('<img src="' + accUrl + '" alt="" />');
}