function photo_school(){
	document.write('<p align="center"><span class="text"><a href="../class1/index.html">第一单元</a></span><br>');
	document.write('<span class="text"><a href="../class2/index.html">第二单元</a></span><br>');
	document.write('<span class="text"><a href="../class3/index.html">第三单元</a></span><br>');
	document.write('<span class="text"><a href="../class4/index.html">第四单元</a></span><br>');
	document.write('<span class="text"><a href="../class5/index.html">第五单元</a></span><br>');
	document.write('<span class="text"><a href="../class6/index.html">第六单元</a></span><br>');
	document.write('<span class="text"><a href="../class7/index.html">第七单元</a></span><br>');
	document.write('<span class="text"><a href="../class8/index.html">第八单元</a></span><br>');
	document.write('<span class="text"><a href="../class9/index.html">第九单元</a></span><br>');
	document.write('<span class="text"><a href="../class10/index.html">第十单元</a></span><br>');
	document.write('<span class="text"><a href="../class11/index.html">第十一单元</a></span><br>');
	document.write('<span class="text"><a href="../class12/index.html">第十二单元</a></span><br>');
document.write('<span class="text"><a href="../class13/index.html">第十三单元</a></span><br>');
document.write('<span class="text"><a href="../class14/index.html">第十四单元</a></span></p>');
 }