Grease monkey open url with JavaScript

I use this JavaScript and XPATH with Greasemonkey to open the urls on Piratebay or other pages, if you open a torrent in a new tab the script search for urls containign “imagecurl.org”, “imgcrl.org” or “pixoverflow” then wait 10 seconds and open the url.This saves time, just open all what’s interesting in a new tab then just look at the images :

var XPATH =('//div[@class="nfo"]/pre/a['+
                         'contains(@href,"imagecurl.org") or '+
                         'contains(@href,"imgcrl.org") or ' +
                         'contains(@href,"pixoverflow") ]');
//alert(XPATH);
var link = "";
if (link == "") {
link = document.evaluate(XPATH, document.body, null, 6, null).snapshotItem(0);
    setTimeout(function(){window.open(link,"_self")},10000);
}