function hasClass(obj) {
     var result = false;
     if (obj.getAttributeNode("class") != null) {
         result = obj.getAttributeNode("class").value;
     }
     return result;
  }   

 function stripelist(id) {

    var even = false;
  
    var evenColor = arguments[1] ? arguments[1] : "#fff";
    var oddColor = arguments[2] ? arguments[2] : "#eee";
  
    var list = document.getElementById(id);
    if (! list) { return; }
    
      var lis = list.getElementsByTagName("li");
      for (var i = 0; i < lis.length; i++) {
	    if (!hasClass(lis[i]) && ! lis[i].style.backgroundColor) {
 
	    lis[i].style.backgroundColor = even ? evenColor : oddColor;
              
        }
        even =  ! even;
      }
  }