Super simple image popover with jQuery. Source: http://webdesign.tutsplus.com/tutorials/htmlcss-tutorials/super-simple-lightbox-with-css-and-jquery/

image_popover.js

// Image popover
// http://webdesign.tutsplus.com/tutorials/htmlcss-tutorials/super-simple-lightbox-with-css-and-jquery/
jQuery(document).ready(function($) {
	$('.lightbox_trigger').click(function(e) {
		//prevent default action (hyperlink)
		e.preventDefault();
		//Get clicked link href
		var image_href = $(this).attr("href");
		var flickr_link = $(this).data("flickr");
		/*
		If the lightbox window HTML already exists in document,
		change the img src to to match the href of whatever link was clicked
		If the lightbox window HTML doesn't exists, create it and insert it.
		(This will only happen the first time around)
		*/
		if ($('#lightbox').length > 0) { // #lightbox exists
			//place href as img src value
			$('#lightbox').find('img').attr('src', image_href);
			$('#lightbox').find('a').attr('href', flickr_link);
			//show lightbox window - you could use .show('fast') for a transition
			$('#lightbox').show();
		}
		else { //#lightbox does not exist - create and insert (runs 1st time only)
			//create HTML markup for lightbox window
			var lightbox =
			'<div id="lightbox">' +
				'<div>' + //insert clicked link's href into img src
					'<img src="' + image_href +'" height="100%" />' +
				'</div>' +
				'<p><a href="'+flickr_link+'" target="_blank" class="more">View on Flickr</a></p>' +
			'</div>';
			//insert lightbox HTML into page
			$('body').append(lightbox);
			$('#lightbox').click(function() {
				$('#lightbox').hide();
			});
		}
	});
});

ꞈexample.html

<a href="http://farm6.staticflickr.com/5545/10474193904_ea2bf46227_o.png" data-flickr="http://www.flickr.com/photos/36919433@N08/10474193904" class="lightbox_trigger">
	<img src="http://farm6.staticflickr.com/5545/10474193904_ea2bf46227_o.png" width="100%" />
</a>