I need to highlight every third record returned to a template. I'm using this syntax:

<% control getMemberProjects %>

<% if Pos%3==0 %>
<b>$name</b>
<% end_if %>

<% end_control %>

There is no way to perform modulo or anything more complex than equality with the if statement in the template. Any ideas how to handle this?

A solution would be to alter your dataobjectset in your class by using the customise function (http://api.silverstripe.com/sapphire/view/ViewableData.html#customise).

It is a kind of dirty hack , but you could for example add a booleon to your dataobjectset which you use in the template to decide whether or not to hi-lite the row.

Good luck !