// JavaScript Document

var myImg= new Array(9)
  myImg[0]= "01";
  myImg[1]= "02";
  myImg[2]= "03";
  myImg[3]= "04";
  myImg[4]= "05";
  myImg[5]= "06";
  myImg[6]= "07";
  myImg[7]= "08";
  myImg[8]= "09";
  myImg[9]= "10";

myImgSrc = "";

myImgEnd = ".jpg";

var i = 0;

function loadImg(){
  document.imgSrc.src = myImgSrc + myImg[i] + myImgEnd;
}

function prev(){
  if(i<1){
    var l = i
  } else {
    var l = i-=1;
  }
  document.imgSrc.src = myImgSrc + myImg[l] + myImgEnd;
}

function next(){
  if(i>9){
    var l = i
  } else {
    var l = i+=1;
  }
  document.imgSrc.src = myImgSrc + myImg[l] + myImgEnd;
}

window.onload=loadImg;