<svg version="1.1" xmlns="http://www.w3.org/2000/svg">
	<filter id="grayscale">
		<feColorMatrix type="matrix" values="0.3333 0.3333 0.3333 0 0
		0.3333 0.3333 0.3333 0 0
		0.3333 0.3333 0.3333 0 0
		0 0 0 1 0" />
	</filter>
</svg>
<ul class="gallery" title="Tab after clicking on a thumbnail to cycle though thumbnails">
<li tabindex="1"><img src="http://i.imgur.com/ReX3cYT.png" /></li>
<li tabindex="2"><img src="http://i.imgur.com/5lWA8yx.png" /></li>
<li tabindex="3"><img src="http://i.imgur.com/2tQN6Fn.png" /></li>
<li tabindex="4"><img src="http://i.imgur.com/j1Z4uMN.png" /></li>
</ul>