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(2)); 
//please adjust the number here, the number "3" mean three pieces.

if(myNum == 1) document.write("<a href='http://www.worldheritagetravelexpo.com/index_c.php' target='_blank'><img src='http://www.lvyou168.cn/banner/whte.gif' border='0'></a>");
if(myNum == 2) document.write("<a href='http://www.bjbite.com/' target='_blank'><img src='http://www.lvyou168.cn/banner/bite.gif' border='0'></a>");
//Add or Remove above sentences up to the pieces of BANNER. Something behind "src" is the save location of BANNER.

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