$(function(){
	$blocks = $('#link_shop,#link_corp');
	$blocks.find('.im').animate({opacity:0.8},0)
	$blocks.hover(
		function(){ $(this).find('.im').animate({opacity:1},0) },
		function(){ $(this).find('.im').animate({opacity:0.8},0) }
	);
	
	$back = $('#sback');

	var $img = $(new Image());
	$img.attr('src','/img/back_index.jpg').load(function(){
		reposBackground();
		$back.css({'background-image' : 'url(/img/back_index.jpg)'});
		$(window).bind('resize',function(){ reposBackground() })
	});
	
	function reposBackground()
	{
		top_ = Math.round($('#change_block').offset().top-440);
		$back.css('background-position','center '+top_+'px');
	}
})