/* the overlayed element */
.apple_overlay {
	
	/* initially overlay is hidden */
	display:none;
	
	/* growing background image */
	background-image:url(../img/overlay/white.png);
	
	/* 
		width after the growing animation finishes
		height is automatically calculated
	*/
	width:640px;		
	
	/* some padding to layout nested elements nicely  */
	padding:35px;

	/* a little styling */	
	font-size:11px;
}

/* default close button positioned on upper right corner */
.apple_overlay .close {
	background-image:url(../img/overlay/close.png);
	position:absolute; right:5px; top:5px;
	cursor:pointer;
	height:35px;
	width:35px;
}
<!--[if lt IE 7]>
	<style> 
	div.apple_overlay {
		background-image:url(http://static.flowplayer.org/tools/img/overlay/overlay_IE6.gif);
		color:#fff;
	}
	
	/* default close button positioned on upper right corner */
	div.apple_overlay div.close {
		background-image:url(http://static.flowplayer.org/tools/img/overlay/overlay_close_IE6.gif);
	
	}	
	</style>
	<![endif]-->

/* black version of the overlay. simply uses a different background image */
	div.apple_overlay.black {
		background-image:url(http://static.flowplayer.org/tools/img/overlay/transparent.png);		
		color:#fff;
	}