window.addEvent('domready',function(){
	$('thetop').setStyle('padding','0 0 0 0');
	window.addEvent('scroll',function(){									
		var m=window.getScroll().y+window.getSize().y/2;
		var ofset=$('thetop').getPosition().y;
		var topad=m-ofset;
		$('thetop').setStyle('padding',topad+'px 0 0 0');
	});
});