// ==UserScript==
// @name          Add Google Ads
// @namespace     http://www.randomchaos.com/software/firefox/greasemonkey/aga/
// @description	  Adds Google ads to all pages
// @include       http://*
// ==/UserScript==s

(function() {

var SAFECHARS = "0123456789" +					// Numeric
                "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +	// Alphabetic
                "abcdefghijklmnopqrstuvwxyz" +
                "-_.!~*'()";					// RFC2396 Mark characters
var HEX = "0123456789ABCDEF";
var plaintext = location.href;
var encoded = "";
var inner = "";

for (var i = 0; i < plaintext.length; i++ ) {
    var ch = plaintext.charAt(i);
    if (ch == " ") {
        encoded += "+";				// x-www-urlencoded, rather than %20
    } else if (SAFECHARS.indexOf(ch) != -1) {
        encoded += ch;
    } else {
        var charCode = ch.charCodeAt(0);
        if (charCode > 255) {
            encoded += "+";
        } else {
            encoded += "%";
            encoded += HEX.charAt((charCode >> 4) & 0xF);
            encoded += HEX.charAt(charCode & 0xF);
        }
    }
} // for


inner = '<iframe src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-test&adtest=on&url=' + encoded + '&format=468x60_as" width="468" height="60" scrolling="no"></iframe>';

s = window._content.document.createElement("span");
s.innerHTML = inner;
window._content.document.body.insertBefore(s, document.body.firstChild);

})();