var targetKiller = {
    newTargets: new RegExp(/^_?(blank|new)$/i),
    adjustTargetAttribute: function(element, names)
    {
      var target = element.getAttribute('target');

      if (!target || target == '_top')
        return;

      if (!names[target]) {
        if (this.newTargets.test(target))
          element.setAttribute('target', '_top');
        else
          element.removeAttribute('target');
      }
    },
    adjustTargetAttributes: function(elements, names)
    {
      for (var i = 0; i < elements.length; i++)
        this.adjustTargetAttribute(elements[i], names);
    },
    getWindowNames: function(window, names)
    {
      if (window.name)
        names[window.name] = 1;

      for (var i = 0; i < window.frames.length; i++)
        this.getWindowNames(window.frames[i], names);
    },
    init: function()
    {
      var appcontent = window.document.getElementById("appcontent");

      appcontent.addEventListener("DOMContentLoaded",
        function(event) {
          var window   = event.target.defaultView;
          var document = event.target;

          var names = [];

          targetKiller.getWindowNames(window.top, names);

          //targetKiller.adjustTargetAttributes(document.links, names);
          targetKiller.adjustTargetAttributes(document.forms, names);
        }, true);

      appcontent.addEventListener("mousedown",
        function(event) {
          var window = event.target.defaultView;

          var node = event.target;

          while (node) {
            if (node.nodeName == 'A') {
              var names = [];
              targetKiller.getWindowNames(window.top, names);
              targetKiller.adjustTargetAttribute(node, names);
              break;
            }
          }
        }, true);
    }
  };

  targetKiller.init();