Not really sure what you meant by "the caption in the middle", but here's one solution to get your images appear side by side, using the excellent display:inline-block
:
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title></title>
<style>
div.container {
display:inline-block;
}
p {
text-align:center;
}
</style>
</head>
<body>
<div class="container">
<img src="http://placehold.it/350x150" height="200" width="200" />
<p>This is image 1</p>
</div>
<div class="container">
<img class="middle-img" src="http://placehold.it/350x150"/ height="200" width="200" />
<p>This is image 2</p>
</div>
<div class="container">
<img src="http://placehold.it/350x150" height="200" width="200" />
<p>This is image 3</p>
</div>
</div>
</body>
</html>