Forse ho quasi risolto...mi servirebbe un aiutino finale perché sono poco pratica di Javascript:
riesco a caricare 2 banner ma al terzo mi da errore di runtime...qualcuno mi sa dire qual é l'errore nel mio JavaScript?

Ecco il codice:

codice:
<script type="text/javascript" language="JavaScript">
<!--
banner=new Array;

banner[0] = '<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" width="644" height="80" id="bannerElecom" align=""><param name=movie value="bannerElecom.swf"><param name=quality value=high><embed src="bannerElecom.swf" quality=high  width="644" height="80" name="bannerElecom" align="" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed></object>';

banner[1] = '<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" width="644" height="80" id="bannerSport" align=""><param name=movie value="bannerSport.swf"><param name=quality value=high><embed src="bannerSport.swf" quality=high  width="644" height="80" name="bannerSport" align="" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed></object>';

banner[2] = '<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" width="644" height="80" id="bannerDiMascio" align=""><param name=movie value="bannerDiMascio.swf"><param name=quality value=high><embed src="bannerDiMascio.swf" quality=high  width="644" height="80" name="bannerDiMascio" align="" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed></object>';

caricato = false;

function caricaBanner() {
   if(!caricato) {
      numimage = Math.round(Math.random()*(banner.length-1));
      document.write(banner[numimage]);
      caricato = true;
   }
   else {
		if(numimage == (banner.length-1)) {
         numimage = 0;
		}
      else {
         numimage++;
      }
		document.write(banner[numimage]);
	}
   setTimeout("caricaBanner()",3000);
}

caricaBanner();

//-->
</script>
Grazie!