$(document).ready(function(){
		var $grid = $('div.grid');
		var $_div = $('div.grid > div');
		
		
		$grid
			.find('section:first')
				.addClass('first')
				.end()
			.find('section:last')
				.addClass('last')
				.end()
		   .height($_div.height());
		
		var $gridSections = $grid.find('section');
		
			
		$gridSections.hover
		(
			function()
			{
				$gridSections.removeClass('on');
				$(this).addClass('on');
			}
		);
	}
);