num = 0; jumpURL = new Array();
jumpURL[0] = "http://kentei.web3plus.net/modules/tinyd0/";
jumpURL[1] = "http://www.life.tohtech.ac.jp/safety/";
function changeImg() { num++; num %= 2; document.banner.src = num + ".gif"; setTimeout("changeImg()",9000); }
function jump() { window.open(jumpURL[num]); }