str = '<ul>';
str += '<li><a href="./city/central.html"><img src="images/gnav06_off.jpg" alt="スペイン中央・西部" /></a></li>';
str += '<li><a href="./city/east.html"><img src="images/gnav07_off.jpg" alt="スペイン東海岸" /></a></li>';
str += '<li><a href="./city/south.html"><img src="images/gnav08_off.jpg" alt="スペイン南部" /></a></li>';
str += '<li><a href="school/"><img src="images/gnav09_off.jpg" alt="スペイン豆知識" /></a></li>';
str += '</ul>';
document.write(str);