//listado de frases sobre las que opera
var frase=new Array()
frase[0]='Waste no more time talking about great souls and how they should be: become one yourself.<p align="right" style="font-size:11px">Marcus Aurelius Antoninus 121AD-180AD</p>'
frase[1]='Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed it is the only thing that ever has.<br /><p align="right" style="font-size:11px">Margaret Mead 1901 – 1978</p>'
frase[2]='If you have knowledge, let others light their candles at it <p align="right" style="font-size:11px">Margaret Fuller 1810 – 1850</p>'
frase[3]='You cannot create experience. You must undergo it <p align="right" style="font-size:11px">Albert Camus 1913 – 1960</p>'
//frase[]='.<br>'

//calcula aleatoriamente la frase
var cualfrase=Math.floor(Math.random()*(frase.length))
//escribe la frase elegida al azar
document.write(frase[cualfrase]);