title: Unselecting values in multiselect using val() and prop
body: <p>Look at this fiddle: <a href="http://jsfiddle.net/imparator/XPGa8/1/" rel="nofollow">http://jsfiddle.net/imparator/XPGa8/1/</a></p>
  
  <p>First, I am selecting the value "Volvo" of the select list: </p>
  
  <pre><code>$("select").val('volvo');
  </code></pre>
  
  <p>Later, when I try to unselect it like this: </p>
  
  <pre><code>$("select").val('volvo').prop("selected", false);
  </code></pre>
  
  <p>The value volvo still stays selected as you can see from the fiddle. </p>
  
  <p>How can I unselect a value in multiselect using jquery? </p>