Changing the colour of side boxes

I am using the original template(contemporary green) I think. How do you change the colour of the bar below the Boxes

This picture should make it clear

<a href="http://img137.imageshack.us/my.php?image=themse4.jpg" target="_blank"><img src="http://img137.imageshack.us/img137/5066/themse4.th.jpg" border="0" alt="Free Image Hosting at www.ImageShack.us" /></a>

Its green and i would like to change it to a colour I specify!!

I'll thank people in advance for helping!!!

In your stylesheet.css file find this and enter your html color code where highlighted:

.leftBoxContainer, .rightBoxContainer {
	margin: 0em;
	border: 1px solid #9a9a9a;
	border-bottom: 5px solid #336633;
	margin-top: 1.5em;
	}

That worked!

Thanks :)