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;