var addr="vda0?aadqfdq-mds";

function writeAddr() {
    for (i = 0; i < addr.length; i++)
        document.write(String.fromCharCode(addr.charCodeAt(i)+1));
}

document.write('<a HREF=');
document.write('"mailto:');
writeAddr();
document.write('">');
writeAddr();
document.write('</a>');