<!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").css({ borderColor:"#FFFF00", borderWidth:"3px", borderStyle:"solid", width:"400px", height:"400px" }); //下の記述でも可 /* $("img").css({ border:"3px solid #FFFF00", width:"400px", height:"400px" }); */ }); }); </script> </head> <body> <img src="img/200x200.png"> <img src="img/200x200.png"> <img src="img/200x200.png"> <input type="button" value="click"> </body> </html>