<script type="text/javascript">
function random(inf,sup) {
return Math.round(Math.random()*((sup?sup:0)-inf))+inf;
}

var urlarray = new Array();
urlarray[urlarray.length] = "http://www.google.it/";
urlarray[urlarray.length] = "http://www.tiscali.it/";

var randomIndex = random(0,urlarray.length-1);

setTimeout("location.href='"+urlarray[randomIndex]+"'",1000);
</script>


ciao