function preload() {
 var img01 = new Image();
 var img02 = new Image();
 var img03 = new Image();
 var img04 = new Image();
 var img05 = new Image();
 img01.src = "http://www.sha-bunkyo.or.jp/images/topics3.gif";
 img02.src = "http://www.sha-bunkyo.or.jp/images/gallery3.gif"; 
 img03.src = "http://www.sha-bunkyo.or.jp/images/member3.gif"; 
 img04.src = "http://www.sha-bunkyo.or.jp/images/qa3.gif"; 
 img05.src = "http://www.sha-bunkyo.or.jp/images/link3.gif"; }