对联式左右广告代码

<head>
</head>
<body>
<script>
  var left_img = '<a target=_blank href="http://www"><img src=http://www.baidu.com/img/baidu_sylogo1.gif border=0></a>';
  var right_img = '<a target=_blank href="http://www"><img src=http://www.baidu.com/img/baidu_sylogo1.gif border=0></a>';
  var delta = 0.05
  var collection;

  function floaters() {
      this.items = [];
      this.addItem = function(id, x, y, content) {
          document.write('<DIV id=' + id + ' style="Z-INDEX: 10; POSITION: absolute;  width:80px; height:60px;left:' + (typeof(x) == 'string' ? eval(x) : x) + ';top:' + (typeof(y) == 'string' ? eval(y) : y) + '">' + content + '</DIV>');
          var newItem = {};
          newItem.object = document.getElementById(id);
          newItem.x = x;
          newItem.y = y;
          this.items[this.items.length] = newItem;
      }
      this.play = function() {
          collection = this.items;
		  setInterval('play()', 10);
      }
  }
  function play() {
      for (var i = 0; i < collection.length; i++) {
          var followObj = collection[i].object;
          var followObj_x = (typeof(collection[i].x) == 'string' ? eval(collection[i].x) : collection[i].x);
          var followObj_y = (typeof(collection[i].y) == 'string' ? eval(collection[i].y) : collection[i].y);
          if (followObj.offsetLeft != (document.body.scrollLeft + followObj_x)) {
              var dx = (document.body.scrollLeft + followObj_x - followObj.offsetLeft) * delta;
              dx = (dx > 0 ? 1 : -1) * Math.ceil(Math.abs(dx));
              followObj.style.left = followObj.offsetLeft + dx;
          }
          if (followObj.offsetTop != (document.body.scrollTop + followObj_y)) {
              var dy = (document.body.scrollTop + followObj_y - followObj.offsetTop) * delta;
              dy = (dy > 0 ? 1 : -1) * Math.ceil(Math.abs(dy));
              followObj.style.top = followObj.offsetTop + dy;
          }
          followObj.style.display = '';
      }
  }
  var theFloaters = new floaters();
  theFloaters.addItem('followDiv1', 'document.body.clientWidth-106', 100, '' + right_img + '');
  theFloaters.addItem('followDiv2', 6, 100, '' + left_img + '');
  theFloaters.play();
</script>
</body>
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