Child link color

My theme uses white links over a blue menu bar for the parent page links, but if I create any child pages, the links appear beneath the blue menu bar against a white background – so they can’t be seen. I’ve found the following under the menu heading in the .css file, but it controls the color of all the links. How can I change the color of the sub-links?
Many thanks!
Rip

#menu a {
	display: block;
	padding: 0 50px;
	background: url(images/img03.jpg) no-repeat right 50%;
	text-decoration: none;
	text-transform: uppercase;
	font-size: 11px;
	color: #FFFFFF;
}