function previewVideo(mediaUrl) {
	var height = 310;
	var width = 320;
	
	var top = parseInt((screen.height - height) / 2, 10);
	var left = parseInt((screen.width - width) / 2, 10);
	
	window.open("../../Admin/VideoPreview.aspx?mediaUrl=" + escape(mediaUrl), "videoPreview", "top=" + top + ",left=" + left + ",height=" + height + ",width=" + width + ",menubar=no,resizable=no,scrollbars=no,status=yes,toolbar=no", true);
}