function adArray() {
 for (i=0; i*2<adArray.arguments.length; i++) {
  this[i] = new Object();
  this[i].src = adArray.arguments[i*2];
  this[i].href = adArray.arguments[i*2+1];
 }
 this.length = i;
}
function getAdNum() {
 dat = new Date();
 dat = (dat.getTime()+"").charAt(8);
 if (dat.length == 1)
  ad_num = dat%ads.length;
 else
  ad_num = 0;
 return ad_num;
}
 
var ads = new adArray(
"http://ad.zanox.com/ppv/?2587591C1793547998","http://ad.zanox.com/ppc/?2587591C1793547998T",
"http://www.booksfactory.com/images/banner_toolbar.gif","http://www.booksfactory.com/toolbar/books_of_the_world.exe",
"http://www.casadellibro.com/img/creatividades/bann_468x60_gen_01.gif","http://www.casadellibro.com/homeAfiliado?seccion=1&ca=67",
"http://www.booksfactory.com/images/468x60_ayuda.gif","http://www.ayudaenaccion.org",
"http://rcm-images.amazon.com/images/G/01/associates/2007/served-banners/kindle/us_banner_kindle_468x60.gif","http://www.amazon.com/b?node=133141011&tag=booksoftheworld&camp=0&creative=0&linkCode=ur1&adid=0BFD6ZRH5RPFP4F4EG7G&",
"http://www.booksfactory.com/images/buscadores.gif","http://www.booksfactory.com/buscalibros/buscalibros.exe",
"http://www.internetbookshop.it/images/pp/i1.gif","http://www.internetbookshop.it/hme/hmelib.asp?shop=919",
"http://www.booksfactory.com/images/esp1468.gif","http://www.amazon.com/exec/obidos/redirect?tag=booksoftheworld&path=tg/browse/-/301731",
"http://www.cyberferia.com/ssl/asocyld/banners/271/0006060banner.gif","http://www.lsf.com.ar/default.asp?vienede=booksworld"
);

var ad_num = getAdNum(); 

document.write('<CENTER><TABLE CELLPADDING=0 CELLSPACING=1 BORDER=0><TR><TD>'
+'<A HREF="'+ads[ad_num].href+'" target="_blank"><IMG SRC="'+ads[ad_num].src+'" '
+'HEIGHT=60 WIDTH=468 BORDER=0 name=js_ad></A></TD></TR></TABLE></CENTER>');


link_num = document.links.length-1;

function rotateSponsor() {
 if (document.images) {
  ad_num = (ad_num+1)%ads.length;
  document.js_ad.src = ads[ad_num].src;
  document.links[link_num].href = ads[ad_num].href;
  setTimeout("rotateSponsor()",45000);
 }
}
setTimeout("rotateSponsor()",45000);