用label，例如：
.add_cart_radio{float:left;
margin-top:0.5em;
margin-right:0.5em;
}
.add_cart_radio?input[type="radio"]{
display:none;
}
.add_cart_radio?input[type="radio"]?+?label{
padding:0.2em?1em;
border:1px?solid?#CCCCCC;
border-radius:0.5em;
color:#999;
}
.add_cart_radio?input[type="radio"]:checked?+?label{
padding:0.2em?1em;
border:1px?solid?#FF6600;
border-radius:0.5em;
background:#FF6600;
color:#FFFFFF;
}