Bahhh. Of course you can stop the space with <p>s. Just add this code in your <head> tag:
<style type="text/css">
<!--
p { margin: 0px; }
-->
</style>
Or, if it's an individual <p> you want to make margin-free:
<p style="margin: 0px;">Para 1, blah, lorem ipsum, etc...</p>
<p style="margin: 0px;">Para 2, blah, lorem ipsum, etc...</p>
Assign CSS classes to areas? As in the <area> tag? or.. what?