Ubiquity Command: Google site search on the current page

//Google site search ubiquity command
//Search the current webpage using google site search
CmdUtils.CreateCommand({
  name: "google-site-search",
  icon: "http://www.google.com/favicon.ico",
  author: { name: "Nanya Bizuidenhoud", email: "netsuke87@yahoo.com"},
  description: "Search the current website for the given keyword using google site search",
  help: "Simply type google-site-search in the ubiquity command interface, input the keyword to search for and the website you are looking at will be searched using google site search for the specified keyword",
  takes: {"keyword": noun_arb_text},
  preview: function( pblock, searchTerm) {
    pblock.innerHTML = "Searches current site for: " + searchTerm.text;
  },
  
  execute: function(keyword) {
    var url = context.focusedWindow.document.URL;
    var search="http://www.google.com/search?sitesearch="+url+"&as_q="+keyword.text+"&x=0&y=0"
    Utils.openUrlInBrowser(search);
    
  }
})