var mfBanners = [
['http://www.metrive.com.ar', 'http://saltonline.com.ar/banners/images/metrive468aa.gif'], 
['http://saltonline.com.ar/turismo/portada.htm', 'http://saltonline.com.ar/banners/images/turismo468.gif'],
['http://saltonline.com.ar/sierra/inicio.htm', 'http://saltonline.com.ar/banners/images/bannersierra468a.jpg'],
['http://saltonline.com.ar/firpo/portada.htm', 'http://saltonline.com.ar/banners/images/firpologo468.jpg']

];
var mfIe = false;
if( document.all) {
mfIe = true;
}
var mfBannerIndex = 0;
function mfBannerChange() {
var htmlString = '<a target="_blank" href="'+mfBanners[mfBannerIndex][0]+'"> <img border="0" src="'+mfBanners[mfBannerIndex][1]+'"></a>';
if( mfIe) {
document.all.banner.innerHTML = htmlString;
}
else {
document.layers["banner"].document.open();
document.layers["banner"].document.write( htmlString);
document.layers["banner"].document.close();
}
if(mfBannerIndex < mfBanners.length - 1)
mfBannerIndex++;
else
mfBannerIndex = 0;
}
setInterval("mfBannerChange()", 3500);