// JavaScript Document

var imageSrc = "../images/disegni/";
var ext =".jpg";
var numOfImg = 7;
var images = new Array();
var index = 0;

function preloader(){
  for(var i=0;i<numOfImg;i++){	
	var img = new Image();
	img.src = imageSrc + (i+1) + ext;
	images[i] = img;
  }
  getImage(0);
}

function getNext(){
  if(index<numOfImg-1){
	  index++;}
  getImage(index);
}

function getPrevious(){
  if(index>0){
	  index--;}  
  getImage(index);
}

function getImage(xx){
	div = document.getElementById('attachment');
	div.innerHTML ="";
	div.appendChild(images[xx]);
}