// ==UserScript==
// @name      Google Thumbnails
// @namespace http://www14.plala.or.jp/operairc/
// @include   http://www.google.com/search*
// @include   http://www.google.co.jp/search*
// ==/UserScript==

(function() {
    var result = document.evaluate('//p[@class="g"]', document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    for(var i=0,len=result.snapshotLength;i<len;i++) {
        var anc = document.evaluate('./a[1]', result.snapshotItem(i),null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue.href;
        var img = document.createElement('img');
        img.src = 'http://thumbs.bookmacro.com/u/' +anc;
        img.alt = 'thumbnail';
        result.snapshotItem(i).insertBefore(img,result.snapshotItem(i).firstChild);
    }
})();