jQuery: testing for existence of something
<p>Newbie alert...</p>

<p>I'm trying to make an educational that uses different audio players (with different ids) depending on the browser.  In some cases, the div ids will be #f-FIVE, for example, or, in other cases just #FIVE.  This is not something I have a lot of control over due to the audio players.  </p>

<p>Using jQuery, I want to use the div ids to test for which audio player is being used. </p>

<p>In this fiddle <a href="http://jsfiddle.net/eft84/15/" rel="nofollow">http://jsfiddle.net/eft84/15/</a>, I am trying (unsuccessfully) to fade out an element using an if then structure if #f-FIVE exists.  Would you be kind enough to help me spot my errors. </p>
