Manual Slideshow

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<html>
<head>
	<title>Manual Slideshow | par NGLESSON</title>
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	<meta name="author" content="Mezgani said">
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	<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
	<link href="style.css" rel="stylesheet" type="text/css">
</head>
<body class="container">
<div class="row">
	<div class="col-lg-6 mt-5">
		<h2 class="text-center">Manual Slideshow</h2>
		<div class="col-lg-12">
			<img class="Slideshow" src="../../assets/imgs/menu/citation-motivation.jpg" >
			<img class="Slideshow" src="../../assets/imgs/menu/problematique.jpg" >
			<img class="Slideshow" src="../../assets/imgs/menu/e-learning-developpement.jpg" >
			<button class="w3-button w3-black w3-display-left" onclick="plusDivs(-1)">&#10094;</button>
			<button class="w3-button w3-black w3-display-right" onclick="plusDivs(1)">&#10095;</button>
		</div>
	</div>		
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script type="text/javascript" src="script.js"></script>
</body>
</html>
.Slideshow{
    width: 100%;
    height: 400px;
}

var slideIndex = 1;
showDivs(slideIndex);

function plusDivs(n) {
  showDivs(slideIndex += n);
}

function showDivs(n) {
  var i;
  var x = document.getElementsByClassName("Slideshow");
  if (n > x.length) {slideIndex = 1}    
  if (n < 1) {slideIndex = x.length}
  for (i = 0; i < x.length; i++) {
     x[i].style.display = "none";  
  }
  x[slideIndex-1].style.display = "block";  
}
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