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

function stripe(id) {

  var even = false;

  var evenColor = arguments[1] ? arguments[1] : "#fff";
  var oddColor = arguments[2] ? arguments[2] : "#eee";

  var table = document.getElementById(id);
  if (! table) { return; }
  
  var tbodies = table.getElementsByTagName("tbody");

  for (var h = 0; h < tbodies.length; h++) {
  
    var trs = tbodies[h].getElementsByTagName("tr");
    for (var i = 0; i < trs.length; i++) {
    if (!hasClass(trs[i]) && ! trs[i].style.backgroundColor) {

         var tds = trs[i].getElementsByTagName("td");
      
         for (var j = 0; j < tds.length; j++) {
      
          var mytd = tds[j];

         if (! hasClass(mytd) && ! mytd.style.backgroundColor) {
      
	      mytd.style.backgroundColor = even ? evenColor : oddColor;
            
          }
        }
      }
     even =  ! even;
    }
  }
}