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[JAVASCRIPT] pobierz, plaintext 
 <select class="form" name="Cenaod" id="test1">
          <option value="brak">---</option>
          <option value="1000">1000</option>
          <option value="2000">2000</option>
          <option value="5000">5000</option>      
    </select>
 
   <select class="form" name="Cenado" id="test2">
          <option value="brak">---</option>
          <option value="1000">1000</option>
            <option value="2000">2000</option>
            <option value="5000">5000</option>
    </select>
 
<script>
 document.getElementById('test1').onchange = function(){
  var i,els, el;
  els = document.getElementById('test2').getElementsByTagName('option');
  for( i=0; el = els[i]; i++){
   el.disabled = false;
   if( i <= this.selectedIndex )
    el.disabled = true;
  }
 
 }
</script>
[JAVASCRIPT] pobierz, plaintext