today=new Date();
jran=today.getTime();
function rnd() {
ia=9301;
ic=49297;
im=233280;
jran = (jran*ia+ic) % im;
return jran/(im*1.0);
};
function rand(number) {
return Math.ceil(rnd()*number);
};
document.write("<center>");
for(i=1;i<=1;i++) {
myNum=(rand(5)); //改成你要隨機顯示的圖片數；
if(myNum == 1) document.write("<img src='http://www.jeff-blog.com/images/20091205/IMG_002_650.jpg'>"); //圖片路徑，可用http://
if(myNum == 2) document.write("<img src='http://www.jeff-blog.com/images/20091205/IMG_001_650.jpg'>");
if(myNum == 3) document.write("<img src='http://www.jeff-blog.com/images/20091205/IMG_004_650.jpg'>");
if(myNum == 4) document.write("<img src='http://www.jeff-blog.com/images/20091205/IMG_005_650.jpg'>");
if(myNum == 5) document.write("<img src='http://www.jeff-blog.com/images/20091205/IMG_006_650.jpg'>");

else {
document.write();
}
};
document.write("</center>");