Simple lazy load technique

index.html

<!-- place this at bottom the of your HTML page. it has to be after your images appear in the DOM -->
<script>
	var imgs = document.getElementsByTagName('img');
	// var i = 1 skips first instance. use 0 to do all images
	for (var i = 1; i < imgs.length; i++) {
		var src = imgs[i].src;
		imgs[i].setAttribute('data-src',src);
		// whatever, placeholder image
		imgs[i].src="hello.jpg";
	}
</script>

script.js

// requires unveil.js
// http://luis-almeida.github.io/unveil/

$("img").unveil(200);