Cookieを取得する
function getCookie(name) { var value; name = encodeURIComponent( name ).replace( /([.*()])/g, '\\$1' ); value = document.cookie.match( RegExp ( name + '\\s*=\\s*(.*?)(?:[\\s;,]|$)' ) ); return value ? decodeURIComponent( value[1] ) : ''; }