HTML/Javascript code to extract image URLs from web page.

image-urls.html

<div id="output">
</div>

<script type="text/javascript">
	var images = document.getElementsByTagName('img'),
		i,
		imageUrls = [],
		imageUrlString = '';
	
	for (i = 0; i < images.length; i++) {
		if (imageUrls.indexOf(images[i].getAttribute('src')) == -1) {
			imageUrls[i] = images[i].getAttribute('src');
			imageUrlString += images[i].getAttribute('src') + '<br/>';
		}
	}
	
	document.getElementById('output').innerHTML = imageUrlString;
</script>