This is going to look a mess, but basically it is the following code one right after the other with the bunch of them surrounded by the div which centers everything. The "whole" code in one chunk is below the single sample. The 20px right padding for each image can be adjusted as you desire.
<a href="LINK URL"><img title="" style="padding-right:20px;" src="URL OF IMAGE" alt="" width="64" height="64" /></a>
<div style="text-align:center;"><a href="LINK URL"><img title="" style="padding-right:20px;" src="URL OF IMAGE" alt="" width="64" height="64" /></a><a href="LINK URL"><img title="" style="padding-right:20px;" src="URL OF IMAGE" alt="" width="64" height="64" /></a><a href="LINK URL"><img title="" style="padding-right:20px;" src="URL OF IMAGE" alt="" width="64" height="64" /></a><a href="LINK URL"><img title="" style="padding-right:20px;" src="URL OF IMAGE" alt="" width="64" height="64" /></a></div>