var photo=new Array()
var num=0
photo[0]="images/scene01.jpg"
photo[1]="images/scene02.jpg"
photo[2]="images/scene03.jpg"
photo[3]="images/scene04.jpg"
photo[4]="images/scene05.jpg"
photo[5]="images/scene06.jpg"
photo[6]="images/scene07.jpg"
photo[7]="images/scene08.jpg"
photo[8]="images/scene09.jpg"
photo[9]="images/scene10.jpg"
numero=num+1

function precedente() {
  if (num>0) {
    num--
      document.image.src=photo[num];
    numero=num+1
  }
}
function suivante() {
  if(num<photo.length-1) {
    num++
      document.image.src=photo[num];
    numero=num+1
  }
}