div.form-item input.limit-green,div.form-item textarea.limit-green {
  background: transparent url(../images/knob_green.png) right center no-repeat;
  padding-right:22px;
}

div.form-item input.limit-orange,div.form-item textarea.limit-orange {
  background: transparent url(../images/knob_orange.png) right center no-repeat;
  padding-right:22px;
}

div.form-item input.limit-red,div.form-item textarea.limit-red {
  background: transparent url(../images/knob_red.png) right center no-repeat;
  padding-right:22px;
}

div.form-item textarea.limit-green,div.form-item textarea.limit-orange,div.form-item textarea.limit-red {
  background-position: right top;
}