function noSpam(n, d, tld)
    {
        return n+"@"+d+"."+tld;
    }
    var addy = noSpam("yaacov", "theorem", "ca");
    document.write("<a href=\"mailto:'");
    document.write(addy);
    document.write("'\">");
    document.write(addy);
    document.write("</a>");