jquery 实现返回顶部功能(2)

#backTop i,#callSurvey i{background:url(survey.png) no-repeat;} 
#pubFeedBack{position:fixed;_position:absolute;right:15px;bottom:15px;width:54px;font-size:12px;} 
#backTop,#callSurvey{display:block;width:52px;padding:1px;height:56px;line-height:22px;text-align:center;color:#fff;text-decoration:none;} 
#backTop{display:none;background:#999;} 
#backTop:hover{background:#ccc;zoom:1;text-decoration:none;color:#fff;} 
#backTop i{display:block;width:25px;height:13px;margin:14px auto 8px;background-position:-63px 0;} 
#callSurvey{margin-top:1px;background:#3687d9;} 
#callSurvey:hover{background:#66a4e3;zoom:1;text-decoration:none;color:#fff;} 
#callSurvey i{display:block;width:26px;height:25px;margin:9px auto 0;background-position:0 0;} 
#callSurvey:hover i{background-position:-30px 0;}