function RandomNumber() {
  var today = new Date();
  var num= Math.abs(Math.sin(today.getTime()/1000));
  return num;
}

function RandomGraphics() {
  	var x = RandomNumber();
	/* Tutti i banner
	if (x > .88) {
		<!-- Banner circuito 22 -->
		document.write('<s'+'cript language="javascript" src="http://ad.altervista.org/alternet.ad?c=21&f=0&'+new Date().getTime()+'"><\/s'+'cript>');
		return;
	}
	if (x > .77) {
		<!-- Banner circuito 9 -->
		document.write('<s'+'cript language="javascript" src="http://ad.altervista.org/alternet.ad?c=8&f=0&'+new Date().getTime()+'"><\/s'+'cript>');
		return;
	}
	if (x > .66) {
		<!-- Banner circuito 1 -->
		document.write('<s'+'cript language="javascript" src="http://ad.altervista.org/alternet.ad?c=0&f=0&'+new Date().getTime()+'"><\/s'+'cript>')
		return;
	}
	if (x > .55) {
		<!-- Banner circuito 2 -->
		document.write('<s'+'cript language="javascript" src="http://ad.altervista.org/alternet.ad?c=1&f=0&'+new Date().getTime()+'"><\/s'+'cript>');
		return;	
	}
	if (x > .44) {
		<!-- Banner circuito 3 -->
		document.write('<s'+'cript language="javascript" src="http://ad.altervista.org/alternet.ad?c=2&f=0&'+new Date().getTime()+'"><\/s'+'cript>');
		return;	
	}
	if (x > .33) {
		<!-- Banner circuito 6 -->
		document.write('<s'+'cript language="javascript" src="http://ad.altervista.org/alternet.ad?c=5&f=0&'+new Date().getTime()+'"><\/s'+'cript>');
		return;
	}
	if (x > .22) {
		<!-- Banner circuito 7 -->
		document.write('<s'+'cript language="javascript" src="http://ad.altervista.org/alternet.ad?c=6&f=0&'+new Date().getTime()+'"><\/s'+'cript>');
		return;
	}
	if (x > .11) {
		<!-- Banner circuito 12 -->
		document.write('<s'+'cript language="javascript" src="http://ad.altervista.org/alternet.ad?c=11&f=0&'+new Date().getTime()+'"><\/s'+'cript>');
		return;
	}
	if (x > 0) {
		<!-- Banner circuito 21 -->
		document.write('<s'+'cript language="javascript" src="http://ad.altervista.org/alternet.ad?c=20&f=1&'+new Date().getTime()+'"><\/s'+'cript>');
		return;
	}*/
	
	/* Banner PayPerView - Google AdSense*/
	if (x > .75) {
		<!-- Banner circuito 1 -->
		document.write('<s'+'cript language="javascript" src="http://ad.altervista.org/alternet.ad?c=0&f=0&'+new Date().getTime()+'"><\/s'+'cript>')
		return;
	}
	if (x > .50) {
		<!-- Banner circuito 9 -->
		document.write('<s'+'cript language="javascript" src="http://ad.altervista.org/alternet.ad?c=8&f=0&'+new Date().getTime()+'"><\/s'+'cript>');
		return;
	}
	if (x > .25) {
		<!-- Banner circuito 21 -->
		document.write('<s'+'cript language="javascript" src="http://ad.altervista.org/alternet.ad?c=20&f=0&'+new Date().getTime()+'"><\/s'+'cript>');
		return;
	}
	if (x > 0) {
		<!-- Banner circuito 22 -->
		document.write('<s'+'cript language="javascript" src="http://ad.altervista.org/alternet.ad?c=21&f=1&'+new Date().getTime()+'"><\/s'+'cript>');
		return;
	}


}

var timerID = 0;
var tStart  = null;
var theTime;
var refTime = 0.3;

function UpdateTimer() {
   if(timerID) {
	  clearTimeout(timerID);
	  clockID  = 0;
   }
   if(!tStart) tStart = new Date();
   var   tDate = new Date();
   var   tDiff = tDate.getTime() - tStart.getTime();
   tDate.setTime(tDiff);
   theTime = "" 
		   + tDate.getMinutes() + ":" 
		   + tDate.getSeconds();
   minRef = refTime * 60000;
   if(tDiff >= minRef) {
		Reset();
		RefreshFrame();
   }
   timerID = setTimeout("UpdateTimer()", 1000);
}

function Start() {
   	tStart   = new Date();
   	theTime = "00:00";
	timerID  = setTimeout("UpdateTimer()", 1000);
}
		
function Stop() {
	if(timerID) {
	  clearTimeout(timerID);
	  timerID  = 0;
	}
	tStart = null;
}
		
function Reset() {
   tStart = null;
   theTime = "00:00";
}

function RefreshFrame() {
	location.reload();
}