var moveBlock_min = 0;

function init_moveBlock() {
	moveBlock_min = $$('.box')[0].positionedOffset().top;
	Event.observe(window, 'scroll', function() {
		var scroll = document.viewport.getScrollOffsets().top;
		if (scroll > moveBlock_min - 15) {
			$('pageLeft').style.paddingTop = (scroll - moveBlock_min + 15)+'px';
		} else {
			$('pageLeft').style.paddingTop = '0px';
		}
	});
}

Event.observe(window, 'load', init_moveBlock);