function rot13(input) {
    var alpha="abcdefghijklmnopqrstuvwxyz";
    var newAlpha=new Array();
    for (i = 0; i < alpha.length; i++) newAlpha[alpha.charAt(i)] =
        alpha.charAt((i+13)%26);
    for (i = 0; i < alpha.length; i++)
        newAlpha[alpha.charAt(i).toUpperCase()] =
        alpha.charAt((i+13)%26).toUpperCase();
    var output="";
    for (i = 0; i < input.length; i++) {
        var c=input.charAt(i);
        output += ((c>= 'A' && c <= 'Z') || ( c>= 'a' && c <= 'z') ?
                   newAlpha[c] : c);
    }
    return output;
};

function safemail(rotInput, display) {
    var sOut=rot13(rotInput);
    displayed=(typeof(display)=="undefined") ? sOut : display;
    document.write('<a href=mailto:' + sOut + '>' + displayed + '</a>');
}