Salve, avendo questi codici per far in modo che una frase cambi ogni 5 secondi, non capisco perchè setInterval non funzioni.. I codici sono i seguenti:

codice:
 <HTML>
<HEAD>
<TITLE></TITLE>
<script type ="text/javascript">
function getQuote()
{

var mtQuotes = new Array();

mtQuotes[0] = "I smoke in moderation, only one cigar at a time.";

mtQuotes[1] = "Be careful of reading health books, you might die of a misprint.";

mtQuotes[2] = "Man is the only animal that blushes or needs to.";

mtQuotes[3] = "Clothes make the man. Naked people have little or no influence on society.";

mtQuotes[4] = "One of the most striking differences between a cat and a lie is that a cat has only nine lives.";

var randValue = Math.floor(Math.random() * mtQuotes.length);
document.write(mtQuotes[randValue]);
}

window.setInterval("getQuote()", 500);

</script>
</HEAD>
<BODY onload="getQuote();">
</BODY>
</HTML>
Ho provato anche senza window. prima ma niente..