function stripe(id) {
   // the flag we'll use to keep track of
   // whether the current row is odd or even
   var even = false;

   // obtain a reference to the desired tbody
   // if no such tbody exists, abort
   var tbody = document.getElementById(id);
   if (! tbody) { return; }
     var trs = tbody.getElementsByTagName("tr");

   // ... and iterate through them
   for (var i = 0; i < trs.length; i++) {
             trs[i].className = even ?  "RowEven" : "RowOdd";
         // flip from odd to even, or vice-versa
       even =  ! even;
   }
 }