Insert a div class="AccordionPanel" tag (along with tags for a panel tab and a panel content area) inside the container div tag for the accordion. Do not forget to add the closing </div> tag when you add the code. For example:

<div id="Accordion1" class="Accordion">
	<div class="AccordionPanel">
		<div class="AccordionPanelTab"></div>
		<div class="AccordionPanelContent"></div>
	</div>
</div>

The preceding code adds a panel to the Accordion widget. You can add unlimited panels.