example/index.html

<html>
<head>
    <script src="../index.js"></script>

    <style>
        #grid {
            max-width: 1024px;
            margin: 0 auto;
        }

        .imageholder {
            margin: 20px auto;
            transition: all 0.5s;
            position: relative;
        }

        .imageholder.imageholder--notloaded {
            top: 20px;
        }

        .imageholder.imageholder--loaded {
            top: 0;
        }
    </style>
</head>
<body>

<div id="grid"></div>

<script>
    var images = [
        'https://images.unsplash.com/reserve/uvRBqDAfQfaGPJiI6lVS_R0001899.jpg?dpr=1&auto=compress,format&fit=crop&w=1199&h=794&q=80&cs=tinysrgb&crop=',
        'https://images.unsplash.com/photo-1435777940218-be0b632d06db?dpr=1&auto=compress,format&fit=crop&w=1199&h=675&q=80&cs=tinysrgb&crop=',
        'https://images.unsplash.com/photo-1464306208223-e0b4495a5553?dpr=1&auto=compress,format&fit=crop&w=1199&h=799&q=80&cs=tinysrgb&crop=',
        'https://images.unsplash.com/photo-1468413922365-e3766a17da9e?dpr=1&auto=compress,format&fit=crop&w=1199&h=615&q=80&cs=tinysrgb&crop=',
        'https://images.unsplash.com/photo-1473684909030-c634818c89d1?dpr=1&auto=compress,format&fit=crop&w=798&h=1200&q=80&cs=tinysrgb&crop='
    ];

    var loaders = [];

    function Click() {
        console.log("Click", arguments);
    }

    for (var i = 0; i < images.length; i++) {
        if (i === images.length - 1) {
            loaders.push(new ImageLoader('grid', images[i], 798, 1200, '#efefef', Click));
        } else {
            loaders.push(new ImageLoader('grid', images[i], 1024, 768, '#efefef', Click));
        }
    }

</script>
</body>
</html>