r_time = 12000;
myUrl = new Array();
myUrl[0] = "http://www.impressjapan.jp/books/54130";
myUrl[1] = "http://direct.ips.co.jp/book/ihtml/slik/";
myUrl[2] = "http://direct.ips.co.jp/book/ihtml/zalman/";
myUrl[3] = "http://www.impressjapan.jp/books/271003";
//myUrl[4] = "http://www.cguild.com";

myImg = new Array();
myImg[0]="images/banner/54130_728-90.gif";
myImg[1]="images/banner/20100227mairpro_728_90_2.gif";
myImg[2]="images/banner/ij118709001_banner_728_90.gif";
myImg[3]="images/banner/271003_728_90.gif";
//myImg[4]="images/banner/top-superbanner.jpg";

myBookId = new Array();
myBookId[0] = "54113";
myBookId[1] = "ij118809001";
myBookId[2] = "zalman";
myBookId[3] = "271003";
//myBookId[4] = "54050";

myImg2 = new Array();
for (i in myImg) {
   myImg2[i] = new Image();
   myImg2[i].src = myImg[i];
}
function myImg_change() {
   p = Math.round(Math.random()*(myUrl.length - 1));
   document.banner.src = myImg2[p].src;
   setTimeout("myImg_change()",r_time);
}
function jump2() {
   pageTracker._trackPageview('/books/banner/' + myBookId[p]);
   location.href = myUrl[p];
}