<script language="JavaScript">
<!-- hide from other browsers 

//Pictures to switch inbetween

var Rollpic1 = "img22.jpg";
var Rollpic2 = "img23.jpg";
var Rollpic3 = "img24.jpg";

//Start at the what pic:
var PicNumber=1;
//Number of pics:
var NumberOfPictures=3;
//Time between pics switching in secs
var HowLongBetweenPic=5;

//SwitchPic Function
function SwitchPic(counter){

 if(counter < HowLongBetweenPic){
 
  counter++;
  
  //DEBUG in the status bar at the bottom of the screen
  window.status="Cambia imagen cada 5 segundos : "+counter+" - Imagen nº: "+PicNumber+" ";
  
  //Display pic in what <IMG> tag roll is what I called the image
  document.roll.src = eval("Rollpic" + PicNumber);
  
  //function calls itself
  CallSwitchPic=window.setTimeout("SwitchPic("+counter+")",500);
  
  }
  
  else{
   //if its not the last picture goto the next picture
   if(PicNumber < NumberOfPictures){
    PicNumber++;
    SwitchPic(0);
   }
   //its the last picture go to the first one
   else{
    PicNumber=1;
    SwitchPic(0);
    }
 
  }

}
// Stop hiding from old browsers -->
</script>