Input Format

Is there a way to select the input format for the various Messaging text blocks and the List Description text block?

For example, I'd like to embed in the List Description the MailChimp archive code that looks something like this:

<style type="text/css">
  <!--
    .display_archive {font-family: arial,verdana; font-size: 12px;}
    .campaign {line-height: 125%; margin: 5px;}
  //-->
</style>
<script language="javascript" src="http://us1.campaign-archive.com/generate-js/?u=372987547bc003074541a4e3&fid=17532 show=10" type="text/javascript"></script>

Right now it displays the above text centered in the block.
Thanks
Steve