// write an email to the screen to prevent spidering
function antiSpamEmail (username, domain, purdyStr, cssClass) {
    purdyStr = (purdyStr == "") ? (username + "@" + domain) : purdyStr;
    var cssTag = (cssClass == "") ? "" : ("CLASS=\"" + cssClass + "\"");
    document.write("<A " + cssTag + " HREF=\"mailto:" + username + "@" + domain + "\">" + purdyStr + "</A>");
}

// the rollover function        
function imgRoll (img, item) {
    document[img].src = ("pic/nav/" + item + ".gif");
}