//From http://davious.org/onepagers/anewstripe.html, which was adapted from http://www.alistapart.com/articles/zebratables/
 onload = function() { stripe ('spreadsheet') };
 function stripe(id) {
    var table = document.getElementById(id);
    if (! table) { return; }
    
    var trs = table.getElementsByTagName("tr");

    for (var i = 0; i < trs.length; i += 2) {
      trs[i].className += "even";
    }
  }