Dropdown box with dependent textfield

Dropdown box with dependent textfield

Hi all,
 
I am using jquery form validation
I have a dropdown box with 'other' as a selection.  When someone selects other than they must fill in a textbox.  I have looked everywhere including the examples here but all i can find is a checkbox dependency (which is no help to me).  I am new to jquery so if anyone can help or give me some where to start that would be awesome.
 
<p>
  <select name="fruits">
    <option value="apple">apple</option>
    <option value="orange">orange</option>
    <option value="other">other</option>
  </select>
 
</p>
<p>
  <input type="text" name="other" id="other" /> dependent field