var stripe = function() {
  var tables = document.getElementsByTagName("table");  
  for(var x=0;x!=tables.length;x++){
    var table = tables[x];
    if (! table) { return; }    
    var tbodies = table.getElementsByTagName("tbody");    
    for (var h = 0; h < tbodies.length; h++) {
      var even = true;
      var trs = tbodies[h].getElementsByTagName("tr");      
      for (var i = 0; i < trs.length; i++) {
        trs[i].onmouseover=function(){ this.className += " ruled"; return false }
        trs[i].onmouseout=function(){ this.className = this.className.replace("ruled", ""); return false }        
        if(even)
          trs[i].className += " even";        
        even = !even;
      }
    }
  }
}
window.onload = stripe;