site_search command on ubiquity

CmdUtils.CreateCommand({
  names: ["site search"],
  icon: "http://www.google.com/favicon.ico",
  description: "Search, using google, on the current site only.",
  author: {name: "Victor Bogado", email: "victor@bogado.net"},
  license: "GPL",
  arguments: [{role: 'object', nountype: noun_arb_text}],
  preview: function preview(pblock, args) {
    pblock.innerHTML = "Search <b>" + args.object.html + "</b> on " +  CmdUtils.getDocument().location.host  + ".";
  },
  execute: function execute(args) {
    Utils.openUrlInBrowser("http://www.google.com/search?q=" + args.object.html + "+site:" + CmdUtils.getDocument().location.host);
  }
});