var how_many_ads = 5;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;
if (ad==1 || ad==2 || ad==3)
{
/*
megabanner="si";
document.write('<div name=publicidad id=\"megabanner\"><div id=\"iframe\" class=\"mostrar\">');
document.write('<iframe src=\"/data/recursos/banners/clientes/yage/yage_chevrolet_20070607.asp\" height=\"90\" width=\"728\" hspace=\"0\" vspace=\"0\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"></iframe>');
document.write('</div></div>');
*/
}

if (ad==4 || ad==5)
{
megabanner="no";
document.write('');
}