input[type=checkbox]{
  width   : 16px;
  height  : 16px;
  margin  : 0;
  padding : 0;
  opacity : 0;
  filter: "alpha(opacity=0)"; /* IE 8 */
}

input[type=checkbox]+ label{
  display      : inline-block;
  margin-left  : -28px;
  padding-left : 28px;
  background   : url('../images/icon2.png') no-repeat  0px 0px;
  line-height  : 24px;
  opacity : 1;
    font-size: 14px;
    color: #000;
    font-weight: normal;

}

input[type=checkbox]:hover + label{
   background: url('../images/icon2.png') no-repeat 0px -51px;

}
input[type=checkbox]:checked + label{
   background: url('../images/icon2.png') no-repeat 0px -25px;

}
input[type=checkbox]:checked:hover + label{
   background: url('../images/icon2.png') no-repeat 0px -81px;

}