anchor.diff:  
   div.radio input {
     opacity: 0;
  -  filter: alpha(opacity:0);
  +  filter: alpha(opacity=0);
     text-align: center;
     display: inline-block;
     background: none;
  
positive.code: 
  div.checker input {
    opacity: 0;
    filter: alpha(opacity:0);
    display: inline-block;
    background: none;
  }
  
negative.code:   height: 25px;
    border: none;
    cursor: default;
  }
  