.f_checkbox,.f_radio {
  background-repeat:no-repeat;
  background-position:3px center;
  height:16px;
  display:block;
  cursor:pointer;
  line-height:120%;
}
.f_radio {
  padding:4px 24px;
}
.f_checkbox {
  padding:0.5em 24px;
}
.unchecked {
  background-image:url(chk_off.png);
}
.checked {
  background-image:url(chk_on.png);
}
.unselected{
  background-image:url(rdo_off.png);
}
.selected{
  background-image:url(rdo_on.png);
}