Rot13

jquery_email_obfuscation_against_spam_bots.js

/*
Put your "encrypted" (ROT13) email address in a link and this script will decrypt it.
This helps against SPAM-bots (they almost never have a javascript engine running,
it's to computationally expensive to be worthwhile).


Useage:
<a href="mailto:qrzb@qrzb.pbz">qrzb@qrzb.pbz</a>

Becomes
<a href="mailto:demo@demo.com">demo@demo.com</a>


Requires use of a standard ROT13 converter, for example:
http://rot13.de/index.php

Modified from:
http://github.com/buckwilson/jquery-grab-bag
*/

$.fn.rot13 = function() {
    this.each(function() {
        var rot13fn = function(chr) {
            var cc = chr.charCodeAt(0);
            if (cc >= 65 && cc <= 90) cc = 65 + ((cc - 52) % 26);
            else if (cc >= 97 && cc <= 122) cc = 97 + ((cc - 84) % 26);
            else if (cc >= 48 && cc <= 57) cc = 48 + ((cc - 43) % 10);
            return String.fromCharCode(cc);
        };

        $(this).text($(this).text().replace(/[a-z0-9]/ig, function(chr) {return rot13fn(chr)}));
        $(this).attr("href", "mailto:" + $(this).attr("href").replace("mailto:", "").replace(/[a-z0-9]/ig, function(chr) {return rot13fn(chr)}));
    });
    return this;
};

$(document).ready(function () {
    $("a[href^=mailto]").rot13();
});