anchor.diff:        padding: 10px;
         font-size: 11px;
       }
  -    a { color: #fff; }
  -    a:visited { color: #999; }
  -    a:hover { color: #fff; background-color:#000; }
  +    #traces a {
  +      color: #000;
  +    }
   
     </style>
   
  
positive.code:   <div id='wrapper'>
      <div id='header'>
        <h1>You have encountered a crabgrass error!</h1>
        <input type="submit" value="Show Details" id="details" />
      </div>
      <div id='content'>
        <%= @contents %>
  
negative.code:       if (!document.getElementById) {
            return;
        }
        var linksDiv = document.getElementById('links');
        var detailsToggle = document.getElementById('details');
        var contentDiv = document.getElementById('content');
        linksDiv.style.display = "block";
        contentDiv.style.display = "none";
        addEvent(detailsToggle, 'click', toggleDetails, false);
      }
  