width="950"; //Anchura del banner 
height="200"; //Altura del banner 

banners= new Array(); 
banners[0]="/banner1.gif";
banners[1]="/banner2.jpg";
banners[2]="/banner3.jpg";
banners[3]="/banner4.jpg";
banners[4]="/bannersanto.jpg";

totalbanners = banners.length; 
var ahora = new Date() 
var segundos = ahora.getSeconds() 
var ad = segundos % totalbanners; 
seleccionado=banners[ad]; 
localizador=seleccionado.lastIndexOf('.'); 
localizador2=localizador+4 
extension=seleccionado.substring(localizador+1,localizador2);  
archivo=seleccionado.substring(0,localizador); 

document.write("<center>"); 
if (extension=="swf"){ 
flash=seleccionado; 
document.write('<OBJECT CLASSID=\"clsid:D27CDB6E-AE6D-11cf-96B8-444553540000\" width=' + width + ' height=' + height + ' CODEBASE=\"http://active.macromedia.com/flash4/cabs/swflash.cab#version=4,0,0,0\">'); 
document.write('<PARAM NAME=\"MOVIE\" VALUE=\"' + flash + '\">'); 
document.write('<PARAM NAME=\"PLAY\" VALUE=\"true\">'); 
document.write('<PARAM NAME=\"LOOP\" VALUE=\"true\">'); 
document.write('<PARAM NAME=\"QUALITY\" VALUE=\"high\">'); 
document.write('<EMBED SRC=' + flash + ' width=' + width + ' height=' + height + ' PLAY=\"true\" LOOP=\"true\" QUALITY=\"high\" PLUGINSPAGE=\"http://www.macromedia.com/shockwave/download/index.cgi? P1_Prod_Version=ShockwaveFlash\">'); 
document.write('</EMBED>'); 
document.write('</OBJECT>');} 
else {document.write('<img src='+seleccionado+' width='+width+' height='+height+'>'); 
document.write('</center>');}