var photo=new Array()
var num=0
photo[0]="rl1.jpg"
photo[1]="rl2.jpg"
photo[2]="rl3.jpg"
photo[3]="rl4.jpg"
photo[4]="rl5.jpg"
photo[5]="rl6.jpg"
photo[6]="rl7.jpg"
photo[7]="rl8.jpg"
photo[8]="rl9.jpg"
photo[9]="rl10.jpg"
photo[10]="rl11.jpg"
photo[11]="rl12.jpg"
photo[12]="rl13.jpg"
photo[13]="rl14.jpg"
photo[14]="rl15.jpg"
photo[15]="rl16.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
  }
}