body { 
	height: 100%;
	margin: 0;
	padding: 0;
	overflow: hidden;
}
	
html {
	height: 100%;
	overflow: hidden;
}
	
#flashcontent {
	width: 600px;
	height: 400px;
	text-align: center;
	position: absolute;
	left: 50%;
	top: 50%;
	margin-left: -300px; 
/* half the width of the div tag which is 50 px */
	margin-top: -200px; 
/* half the height of the div tag which is also 50 px */
}