$(document.body).ready(
		function()
		{
			function positionContent()
			{
				var container = $('#container');

				var windowHeight = $(window).height();
				var containerHeight = container.height();

				var heightDiff = windowHeight - containerHeight;

				if (heightDiff > 0)
				{
					container.css('margin-top', heightDiff/2);
				}
				else 
				{
					container.css('margin-top', 0);
				}
			}
			
			positionContent();
			
			$(window).resize(positionContent);
			
		}
	);