var banners = 2;
var ahora = new Date()
var segundos = ahora.getSeconds()
var ad = segundos % banners;
ad +=1;
if (ad==1) {
flash="banners/banner_gispert_ext.swf"
width="600";
height="250";
}
if (ad==2) {
flash="banners/banner_icpa_ext.swf"
width="600";
height="250";
}