Add Media Maker link on Amazon page

media_maker.user.js

// ==UserScript==
// @name          Media Maker
// @namespace     http://gist.github.com/2156093
// @description	  Add item to Media Maker
// @include       http://*.amazon.*
// ==/UserScript==

// Version 20100312

var DEBUG=true;

addLinkToMediaMaker();
function addLinkToMediaMaker() {
	var val = document.getElementById("ASIN").value;
	if (val!=''){
		var asin = val;
		var header = document.evaluate("//div[@class='buying']/a", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
    if (header == undefined) {
		  header = document.evaluate("//div[@class='buying']//a[contains(@id, 'contribut')]", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
    }
		if (header) {
			// Link to dokusyo meter
			var spl_link = document.createElement('a');
			spl_link.setAttribute('href', 'http://mediamarker.net/u/masaakif/reg?cat=1&asin=' + asin );
			spl_link.setAttribute('title', 'Register to MediaMarker');
			spl_link.setAttribute('target', '_blank');
			spl_link.innerHTML = ' <span style=\"font-size:90%; background-color:#ebf2cc;\">&raquo;MediaMarker&#12395;&#30331;&#37682;</span><br>';
			header.parentNode.insertBefore(spl_link, header);

			// Add to wish list
			/*
			var spl_wishlist_link = document.createElement('a');
			spl_wishlist_link.setAttribute('href', 'http://book.akahoshitakuya.com/add.php?ean=&isbn=' + asin + '&asin=' + asin + '&image=&type=pre' );
			spl_wishlist_link.setAttribute('title', 'Add reading list');
			spl_wishlist_link.setAttribute('target', '_blank');
			spl_wishlist_link.innerHTML = ' <span style=\"font-size:90%; background-color:#ffffcc;\">&raquo;&#35501;&#12415;&#12383;&#12356;&#26412;&#12395;&#36861;&#21152;</span><br>';
			header.parentNode.insertBefore(spl_wishlist_link, header);
			*/
		}
	}
}

function debug() {
	if ( typeof DEBUG != 'undefined' && DEBUG ) {
	console.log.apply(this, arguments)
	}
}

function getTitle(document)
{
	
}