jQuery find if div with id=X exists inside a DOM string
<p>I'm trying to check if a div with an id exists in a string holding some html, so I'm looking for a function that returns true or false. </p>

<p>There's a function hasClass that checks if a div has a certain class</p>

<pre><code>$('#mydiv').hasClass('bar')
</code></pre>

<p>I guess what I'm looking for is something like</p>

<pre><code>var mystring = "some string with html";

mystring.hasId('lookingforthisid');
</code></pre>

<p>How can I check this?</p>
