jquery append html immediately after opening <p> tag

How does one append / place new html directly inside the first found element.

For example, I have text wrapped in <p> tags i.e.
<p>This is my text</p>

How do I add <span id="firstThing">This must be first inside the p tag</span> inside the <p> to create this:
<p><span id="firstThing">FIRST</span>This is my text</p>

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$('<span id="firstThing">This must be inside the p tag</span>').prependTo('p:first');

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kent3800Author Commented:
kent3800Author Commented:
Actually. Now that I've tested this a little bit. This doesn't work. The selector you are using doesn't select anything. Any other ideas?
Sorry, I missed the $() enclosure:

$('<span id="firstThing">This must be inside the p tag</span>').prependTo($('p:first'));

This works in the below code...
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
		<script type="text/javascript" src="includes/jquery/jquery-1.4.js"></script>
		<script type="text/javascript">
				$('<span id="firstThing">This must be inside the p tag</span>').prependTo($('p:first'));
	<p>first paragraph</p>
	<p>second paragraph</p>

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