$('document').ready(function()
	{
		var _H = $('#menu_gauche > ul').height();
		var _HAsce = $('#ascenseur').height();
		var rapport = _H/_HAsce;

		function handleSlide (e, ui)
			{
				$('#menu_gauche').scrollTop(105-(rapport*ui.value));
			}
		
		$('#ascenseur').slider(
			{
				value: 96,
				orientation: 'vertical',
				animate:true,
				slide: handleSlide
			}
		);
	}
);