#iconDiv1{display:none;}.oc_bg{background:url(../images/onlineContact_bg.png) no-repeat}
.btn{display:inline-block;text-decoration:none;cursor:pointer}
#big_C{position:fixed;_position:absolute;width:110px;height:250px;left:0px;top:200px}

#big_C .btn3{position:absolute;width:78px;height:24px;top:83px;left:15px;background-position:21px 83px}
#big_C .btn3:hover{background-position:21px 83px}