可隐藏固定广告---fix不兼容ie6

    <div class="content">
      <p>1</p>
      <p>2</p>
      <p>3</p>
      <p>4</p>
      <p>5</p>
      <p>6</p>
      <p>7</p>
      <p>8</p>
      <p>9</p>
      <p>10</p>
      <p>11</p>
      <p>12</p>
      <div class="fix_box">
        <div class="switch"></div>
      </div>
    </div>

*{margin:0px; padding:0px;}
.content p{line-height:80px;font-size:20px;}
.content{
  width:1000px;
  height:1500px;
  margin:0 auto;
  background:#6FF;
}

.fix_box{
  width:300px;
  height:100px;
  background:#FFC;
  position:fixed;
  top:100px;
  left:-270px;
  *position:absolute;
}

.switch{
  width:30px;
  height:100px;
  background:url(cc.gif) no-repeat;
  cursor:pointer;
  margin-left:270px;
}

$(document).ready(function(){	
  $(".switch").toggle(function(){
	var _left =0;/*($(window).width() - 960) / 2;*///距离左边的距离
	$('.fix_box').animate({left: _left + 'px'});
	$('.switch').css("background","url(ca.gif)");
  },function(){
	$('.fix_box').animate({left: "-270px"});
	$('.switch').css("background","url(cc.gif)");
  })
 
})