y = 0;
ad = new Array(y);
 ad[y++] = "<IMG SRC=\"i/pp/banner.jpg\" border=0\"><br>"
 ad[y++] = "<IMG SRC=\"i/pp/banner1.jpg\" border=0\"><br>"
ad[y++] = "<IMG SRC=\"i/pp/banner2.jpg\" border=0\"><br>"
ad[y++] = "<IMG SRC=\"i/pp/banner3.jpg\" border=0\"><br>"
ad[y++] = "<IMG SRC=\"i/pp/banner4.jpg\" border=0\"><br>"
ad[y++] = "<IMG SRC=\"i/pp/banner5.jpg\" border=0\"><br>"
ad[y++] = "<IMG SRC=\"i/pp/banner6.jpg\" border=0\"><br>"
//Continue if more required
x = Math.floor(Math.random()*(y));
document.write(ad[x]);
// -->