var how_many_ads = 1;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads ;
ad +=1;



if (ad==1)
{
url="explode.htm";
	alt="50.000 VISITAS EN TU WEB PROMOCIONA TU PAGINA";
img="explode.gif";
	width="132";
height="64";    
border="0";
}




document.write(" <a href=" + url +" target='_new '>");
document.write("<img src=" + img + " border=" + border + " width=" + width + " height=" + height + " alt='" + alt + "'>");
document.write("</a>");