function search_tags() {
      document.search_form.action = '/tag/' + document.search_form.search_phrase.value;
      document.search_form.submit();
    }

    function search_similar() {
      document.search_form.action = '/search_sites/' + document.search_form.search_phrase.value;
      document.search_form.submit();
    }

    function checkSearchEnter(e){
      var characterCode;
      if(e && e.which) {
	e = e;
	characterCode = e.which;
      } else {
	e = event;
	characterCode = e.keyCode;
      }

      if(characterCode == 13) {
	document.search_form.action = '/search_sites/' + document.search_form.search_phrase.value;
	document.search_form.submit();
	return false;
      } else {
	return true;
      }
    }

    function stopRKey(evt) { 
      var evt = (evt) ? evt : ((event) ? event : null); 
      var node = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null); 
      if ((evt.keyCode == 13) && (node.type=="text"))  {return false;} 
    } 
 
    document.onkeypress = stopRKey;