// Vertically center page contents
$( document ).ready ( function ()
	{
		$( window ).load ( page_position );
		$( window ).resize ( page_position );
	}
);

function page_position () {
	min_margin = 20;
	offset = ( $( window ).height() - ( $( "#box" ).outerHeight () )) / 2;
	margin = ( offset <= min_margin ) ? min_margin : offset ;
	$( "#box" ).css ( "margin-top", margin + "px" );
}