CSS to Center a DIV

Hello All,

I’m having trouble centering a DIV on my site. The stylesheet code is:

#container {
	width: 400px;
	margin: 0;
	padding: 0;
	background: #999;
} 

.note {
	width: 360px;
	margin: auto 0px;
	padding: 10px 10px;
	background: #D8D8D8;
	border: 1px solid #000;
	text-align: justify;
}
#content .note p {
	padding: 0;
	Margin: 10px 10px;
}

And the HTML on the post is:

<div class="note"><p>The following links access the most competitive prices. Using them helps defray expenses for this website.</p></div>

An example of the DIV in a post here.

Thanks for any help you can give.