$(document).ready(function(){
	
	$(".div_0316").hover(function() {
		$(this).children(".next-button").animate({opacity: "show"}, "slow");
	}, function() {
		$(this).children(".next-button").animate({opacity: "hide"}, "fast");
	});
	
	$(".div_0311").hover(function() {
		$(this).children(".prev-button").animate({opacity: "show"}, "slow");
	}, function() {
		$(this).children(".prev-button").animate({opacity: "hide"}, "fast");
	});

});