function banner(){

var banner_url = new Array()
banner_url[0] = "http://barzellette.altervista.org/banner/banner-00.js"
banner_url[1] = "http://barzellette.altervista.org/banner/banner-01.js"
banner_url[2] = "http://barzellette.altervista.org/banner/banner-02.js"
banner_url[3] = "http://barzellette.altervista.org/banner/banner-03.js"
banner_url[4] = "http://barzellette.altervista.org/banner/banner-04.js"
banner_url[5] = "http://barzellette.altervista.org/banner/banner-05.js"
banner_url[6] = "http://barzellette.altervista.org/banner/banner-06.js"
banner_url[7] = "http://barzellette.altervista.org/banner/banner-07.js"
banner_url[8] = "http://barzellette.altervista.org/banner/banner-08.js"
banner_url[9] = "http://barzellette.altervista.org/banner/banner-09.js"
banner_url[10] = "http://barzellette.altervista.org/banner/banner-10.js"
banner_url[11] = "http://barzellette.altervista.org/banner/banner-11.js"
banner_url[12] = "http://barzellette.altervista.org/banner/banner-12.js"
banner_url[13] = "http://barzellette.altervista.org/banner/banner-13.js"
banner_url[14] = "http://barzellette.altervista.org/banner/banner-14.js"
banner_url[15] = "http://barzellette.altervista.org/banner/banner-15.js"
banner_url[16] = "http://barzellette.altervista.org/banner/banner-16.js"
banner_url[17] = "http://barzellette.altervista.org/banner/banner-17.js"
banner_url[18] = "http://barzellette.altervista.org/banner/banner-18.js"
banner_url[19] = "http://barzellette.altervista.org/banner/banner-19.js"

var num = Math.floor(Math.random()*banner_url.length)
document.write('<script language="JavaScript" src="'+banner_url[num]+'"></script>')

}
banner()