How to make auto select another drop down

<select name="brand" id="brand" onchange="document.getElementById('item').value = document.getElementById('brand').value">
   <option>Please Select</option>
   <option>IBM</option>
   <option>HP</option>
 </select>

 <select name="item" id="item">
   <option>Please Select</option>
   <option>IBM</option>
   <option>HP</option>  
 </select>

Demo

Source