[рони]

Bizon4ik,

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<div>
   <select onchange="$(this).nextAll().hide();$(this).nextAll(this.value).show()">
   <option value='change' >change</option>
   <option value='select'>select</option>
   <option value='input'>input</option></select>
   <select style="display:none"></select>
   <input style="display:none"/>
</div>