<div>

     <select onchange="alert(this.nextElementSibling.id);if(this.options[this.options.selectedIndex].value == '2'){ this.nextElementSibling.style.display='';}else{ this.nextElementSibling.style.display = 'none';}">

         <option value="0">default</option>

         <option value="1">1</option>

         <option value="2">22</option>

     </select>

     <input name="hi" value="100" id="google">

 </div>