div.productclass_change{
margin:0px;
padding:0px 0px 10px 0px;
background:#fff;
}

a.productclass_change:link,a.productclass_change:visited,a.productclass_change:active{
display:block;
text-decoration:none;
font:14px/41px microsoft yahei, Arial, Helvetica, sans-serif;
height:41px;
text-align:left;
background:url(../images/cp1.jpg) 0px 0px no-repeat;
padding-left:63px;
margin:0px;
color:#fff;
}

a.productclass_change:hover{
display:block;
background:url(../images/cp2.jpg) 0px 0px no-repeat;
color: #fff; 
text-decoration: none;
}