Palinator

// ==UserScript==
// @name           Palinator
// @namespace      http://userscripts.org/
// @description    Changes mentions of Palin to Squirrel!!! (see the movie Up!)
// ==/UserScript==


(function() {
    var replacements, regex, key, textnodes, node, s; 

replacements = {
"Sarah Palin": "Squirrel!!!",
"Palin": "Squirrel!!!"
};

    regex = {}; 
    for (key in replacements) { 
        regex[key] = new RegExp(key, 'g'); 
    } 

    textnodes = document.evaluate( "//body//text()", document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null); 

    for (var i = 0; i < textnodes.snapshotLength; i++) { 
        node = textnodes.snapshotItem(i); 
        s = node.data; 
        for (key in replacements) { 
            s = s.replace(regex[key], replacements[key]); 
        } 
        node.data = s; 
    } 

})();