// largely based on code from http://www.alistapart.com/articles/zebratables/

  // this function is needed to work around 
  // a bug in IE related to element attributes
  function hasClass(obj) {
     var result = false;
     if (obj.getAttributeNode("class") != null) {
         result = obj.getAttributeNode("class").value;
     }
     return result;
  }   

 function stripe_el(table) {

    // the flag we'll use to keep track of 
    // whether the current row is odd or even
    var even = false;

    // if arguments are provided to specify the colours
    // of the even & odd rows, then use the them;
    // otherwise use the following defaults:
    var evenColor = arguments[1] ? arguments[1] : "#ffffff";
    var oddColor  = arguments[2] ? arguments[2] : "#f9f9f9";

    // obtain a reference to the desired table
    // if no such table exists, abort
    if (! table || ! hasClass(table)) { return; }
    if ( (" " + hasClass(table) + " ").replace(/[\n\t]/g, " ").indexOf(" zebra ") < 0 ) 
      return;

    // by definition, tables can have more than one tbody
    // element, so we'll have to get the list of child
    // &lt;tbody&gt;s 
    var tbodies = table.getElementsByTagName("tbody");

    // and iterate through them...
    for (var h = 0; h < tbodies.length; h++) {

     // find all the &lt;tr&gt; elements... 
      var trs = tbodies[h].getElementsByTagName("tr");

      // ... and iterate through them
      for (var i = 0; i < trs.length; i++) {

        // avoid rows that have a class attribute
        // or backgroundColor style
        if (! hasClass(trs[i]) &&
            ! trs[i].style.backgroundColor) {

          // get all the cells in this row...
          var tds = trs[i].getElementsByTagName("td");

          // and iterate through them...
          for (var j = 0; j < tds.length; j++) {

            var mytd = tds[j];

            // avoid cells that have a class attribute
            // or backgroundColor style
            if (! hasClass(mytd) &&
                ! mytd.style.backgroundColor) {

              mytd.style.backgroundColor =
                even ? evenColor : oddColor;

              if ( (j == 1) || (j == 2) ) {
                mytd.style.textAlign = "right";
              }

              if ( j < (tds.length - 1) ) {
                mytd.style.whiteSpace = "nowrap";
                mytd.style.paddingRight = "1.5em";
              }


            }
          }
        }
        // flip from odd to even, or vice-versa
        even =  ! even;
      }
    }
  }

 function stripe(id) {
   var my_id = id ? id : "zebra";
   return stripe_el(document.getElementById(my_id));
 } 

 function stripe_all(id) {
   var my_tables = document.getElementsByTagName("table");
   for (var t = 0; t < my_tables.length; t++) {
     stripe_el(my_tables[t], "#ffffff", "#ffffff");
   }
 }