<!DOCTYPE html>
<html lang="ja-JP">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,user-scalable=yes,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.5">
<title></title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script>
$(function(){
$("input").click(function(){
$("img[src$='"+ $(this).attr("value") + "']").css("display","inline-block");
$("img:not([src$='"+ $(this).attr("value") + "'])").css("display","none");
});
});
</script>
</head>
<body>
<p>
<input type="button" value="jpg">
<input type="button" value="gif">
<input type="button" value="png">
</p>
<p>
<img src="img/jpg.jpg">
<img src="img/gif.gif">
<img src="img/png.png">
</p>
</body>
</html>