body {
	margin: 0;
	padding: 0;
	background: #fff url(bg-one.gif) repeat-x;
}

#bg {
	width: 50%;					/* set half the width */
	height: 351px; 				/* height of image! */
	position: absolute;
	top: 0;
	left: 0;
	background: transparent url(bg-two.gif) repeat-x;
}

#content {
	width: 770px;
	margin: 0 auto;
	position: relative;			/* required */
	z-index: 1; 				/* only opera needs this! */
	background-color: #fff;		/* style the way you want */
	top: 100px; 				/* demo purposes only */
	height: 100px;				/* demo only */
}