footer 经典切换 特效

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.dwtab{width:998px; border:1px solid #C2C2C2; height: 33px; line-height: 33px; background: url(../images/dwbg.jpg) repeat-x}
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<ul class="dwtab">
        <li class="hover" οnmοuseοver="setTab('dw',1,5)" id="dw1">指导单位</li>
        <li οnmοuseοver="setTab('dw',2,5)" id="dw2">医院环境</li>
        <li οnmοuseοver="setTab('dw',3,5)" id="dw3">尖端设备</li>
        <li οnmοuseοver="setTab('dw',4,5)" id="dw4">疾病导航</li>
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        <img src="picture/danwei.jpg" alt="上海乳腺科医院（宏康乳腺外科）合作单位" width="939" height="98" />
    </div>
  <pre name="code" class="html"> <div class="dwcon" id="con_dw_2">
        <img src="picture/danwei.jpg" alt="上海乳腺科医院（宏康乳腺外科）合作单位" width="939" height="98" />
    </div>
 <div class="dwcon" id="con_dw_3">
        <img src="picture/danwei.jpg" alt="上海乳腺科医院（宏康乳腺外科）合作单位" width="939" height="98" />
    </div>
 <div class="dwcon" id="con_dw_4">
        <img src="picture/danwei.jpg" alt="上海乳腺科医院（宏康乳腺外科）合作单位" width="939" height="98" />
    </div>

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<style>
.docline2 .hover a {
	background:url(images/sj2014_27.jpg) no-repeat;
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<ul class="docline2">
               <li class="" οnmοuseοver="setTab('two',1,4)" id="two1"><a>乳腺检查</a></li>
               <li class="hover" οnmοuseοver="setTab('two',2,4)" id="two2"><a>乳腺疾病</a></li>
               <li class="" οnmοuseοver="setTab('two',3,4)" id="two3"><a>甲状腺专家</a></li>
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