make the drop down menu show from another buttons click
<p>If I click on my <code>a href</code> button  how do I make the drop down menu show?  </p>

<pre><code>&lt;a href="#" onclick"makeIDCarsMenuShow()" &gt;my button&lt;/a&gt;
&lt;select name="cars" id="cars"&gt;
&lt;option value="volvo"&gt;Volvo&lt;/option&gt;
&lt;option value="saab"&gt;Saab&lt;/option&gt;
&lt;option value="fiat" selected="selected"&gt;Fiat&lt;/option&gt;
&lt;option value="audi"&gt;Audi&lt;/option&gt;
&lt;/select&gt;


&lt;script&gt;
  function makeIDCarsMenuShow(){
    $('#cars').trigger('click');
  }
&lt;/script&gt;
</code></pre>
