draft of a greasemonkey script to add cpl data to amazon

amazon_cpl_greasemonkey.user.js

// ==UserScript==
// @name           Amazon CPL
// @namespace      http://www.lonelylion.com/
// @description    Check for CPL books from Amazon
// @include        http://www.amazon.com/*
// @require        https://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js
// ==/UserScript==

function addMenuItem(title, text) {
    // adds a menu item to the product details on the amazon page
    var m = jQuery('html body.dp div#divsinglecolumnminwidth.singlecolumnminwidth table tbody tr td.bucket div.content ul');
    m.prepend("<li><b>"+title+"</b>: "+text+"</li>");
}

function addToTop(text) {
    // lets you add text to the top of the Amazon page, mostly for debugging
    var m = jQuery('#divsinglecolumnminwidth');
    m.prepend(text);
}


function getISBN() {
    var isbn = jQuery('html body.dp div#divsinglecolumnminwidth.singlecolumnminwidth table tbody tr td.bucket div.content ul li')[3].innerHTML;
    isbn_regex = /\<b\>ISBN-10:\<\/b\>\s(\d+)/;
    isbn = isbn_regex.exec(isbn)[1];
    return isbn;
}

function loadNinjaData(isbn) {
    var ninja = "http://chipubninja.com/branch_search.php?Ntt=" + isbn + "&formats=0&languages=0&audiences=0&ficnonfic=0&onshelfonly=1&showref=0&availability=1";
    GM_xmlhttpRequest({
	method: "GET",
	url: ninja,
	onload: function(response) {
	    var link_to_cpl = jQuery(response.responseText).find('a.whiteButton');
	    if (link_to_cpl.length > 0) {
		addMenuItem('CPL', "<a target='_' href='"+link_to_cpl[1]+"'>Place on Hold</a>");
	    } else {
		addMenuItem('CPL', "isbn "+isbn+" not available at CPL");
	    }
	}
    })
}
loadNinjaData(getISBN());