<!--//
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 Rndnum(number) {
  return Math.ceil(rnd()*number);
};

for(i=1;i<=1;i++) {
  myNum=(Rndnum(21)); //改成你要随机显示的图片数；
  if(myNum == 1) document.write("<img src='/images/banner/index-banner1.jpg'>"); //图片路径，可用http://
  if(myNum == 2) document.write("<img src='/images/banner/index-banner2.jpg'>");
  if(myNum == 3) document.write("<img src='/images/banner/index-banner3.jpg'>");
  if(myNum == 4) document.write("<img src='/images/banner/index-banner4.jpg'>");
  if(myNum == 5) document.write("<img src='/images/banner/index-banner5.jpg'>");
  if(myNum == 6) document.write("<img src='/images/banner/index-banner6.jpg'>");
  if(myNum == 7) document.write("<img src='/images/banner/index-banner7.jpg'>");
  if(myNum == 8) document.write("<img src='/images/banner/index-banner8.jpg'>");
  if(myNum == 9) document.write("<img src='/images/banner/index-banner9.jpg'>");
  if(myNum == 10) document.write("<img src='/images/banner/index-banner10.jpg'>");
  if(myNum == 11) document.write("<img src='/images/banner/index-banner11.jpg'>");
  if(myNum == 12) document.write("<img src='/images/banner/index-banner12.jpg'>");
  if(myNum == 13) document.write("<img src='/images/banner/index-banner13.jpg'>");
  if(myNum == 14) document.write("<img src='/images/banner/index-banner14.jpg'>");
  if(myNum == 15) document.write("<img src='/images/banner/index-banner15.jpg'>");
  if(myNum == 16) document.write("<img src='/images/banner/index-banner16.jpg'>");
  if(myNum == 17) document.write("<img src='/images/banner/index-banner17.jpg'>");
  if(myNum == 18) document.write("<img src='/images/banner/index-banner18.jpg'>");
  if(myNum == 19) document.write("<img src='/images/banner/index-banner19.jpg'>");
  if(myNum == 20) document.write("<img src='/images/banner/index-banner20.jpg'>");
  if(myNum == 21) document.write("<img src='/images/banner/index-banner21.jpg'>");
  else {
    document.write();
  }
};
//-->