Accordion Using The DOM & CSS; Show/hide Not Working?

I'm trying to create a simple javascript accordion that will let me show/hide <p> paragraphs when I click on an <h2>. When the page is loaded, the <p> are automatically hidden. (This part works ok). When you click on the H2, I want the paragraphs to then appear. Something with the h2 onclick event or either the way I'm calling the DOM is not working. I was hoping for some help/guidance.HTML

Code:
<div id="content"> <h2>Header 1</h2> <p>Here is my header 1 paragraph</p> <h2>Header 2</h2> <p>Here is my header 2 paragraph</p> <h2>Header 3</h2> <p>Here is my header 3 paragraph</p> </div>

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