For better source code readability, comment out the white space
e.g.
<a href=""><img src="" /></a><!--
--><a href=""><img src="" /></a><!--
--><a href=""><img src="" /></a><!--
--><a href=""><img src="" /></a>
A quick note: Accessibility guidelines warn developers of placing links back to back. That means <a href="">link</a><a href="">link</a> is a no-no. You're encouraged to place at least a character in between them be it a comma, a pipe, a bullet, or whatever. However, wrapping the links in a list prevents the links from being adjacent e.g. <li><a href="">link</a></li> <li><a href="">link</a></li> <li><a href="">link</a></li> But you'd need to style the list appropriately, and for IE you'd still need to comment out the white space.