function show_video(div){

	$(div).show();
	foDim = $(div).getDimensions();
	vpDim = document.viewport.getDimensions();
	vpSoc = document.viewport.getScrollOffsets();
				
	var top = (vpDim.height - foDim.height) / 2 + vpSoc.top;
	var left = (vpDim.width - foDim.width) / 2 + vpSoc.left;
	
	if (top < 0) { top = 0; }
	if (left < 0) { left = 0; }
	
	$(div).setStyle({
		top: top + 'px',
		left: left + 'px'
	});

}