var currentImage = 0;
var prevImage = 0;
var interval = 2500;
var slide = 0;

function nextImage(){
  var maxImages = images.length-1;
  prevImage = currentImage;
   alert(currentImage);
  if(currentImage != maxImages) currentImage += 1;
  else currentImage = 1;
  document.getElementById('pic1').src = images[currentImage]; 
  document.getElementById('pic1').alt = alt[currentImage];
  
  document.getElementById('p'+currentImage).className = 'activeSlide';
  if(prevImage) document.getElementById('p'+prevImage).className = 'a';
}
function previsiousImage()
{
  var maxImages = images.length-1;
  prevImage = currentImage;
   
  if(currentImage != 1) currentImage -= 1;
  else currentImage = maxImages;
  document.getElementById('pic1').src = images[currentImage];
  document.getElementById('pic1').alt = alt[currentImage];
  
  document.getElementById('p'+currentImage).className = 'activeSlide';
  if(prevImage) document.getElementById('p'+prevImage).className = 'a';
}

function setImage( num )
{

  prevImage = currentImage;
  currentImage = num;
  document.getElementById('pic1').src = images[currentImage];
  document.getElementById('pic1').alt = alt[currentImage];
  
  document.getElementById('p'+currentImage).className = 'activeSlide';
  if(prevImage) document.getElementById('p'+prevImage).className = 'a';
}

function slideOne(){
  nextImage();
  timerID = setTimeout(slideOne, interval);
}

function slideImages()
{
  if(slide == 0){
    slide = 1;
    timerID = setTimeout(slideOne, interval);
    document.getElementById('maPSPlay').className = 'pause';
  }
  else{
    slide = 0;
    clearTimeout(timerID);
    document.getElementById('maPSPlay').className = 'play';
  }
}