$(document).ready(function(){
	$(function() { 
		$(".btn img").hover(
			function () {
				$(this).css("opacity","0.7");},
			function () {
				$(this).css("opacity","1");}
		);
		$(".sample").hover(
			function () {
				$(this).css("opacity","0");},
			function () {
				$(this).css("opacity","1");}
		);
		$(".current img").css("opacity","0");
		$(".current img").hover(
			function () {
				$(this).css("opacity","0");},
			function () {
				$(this).css("opacity","0");}
		);
	});
});