Warning: Please include a link to the DD script in question in your post. See this thread for the proper posting format when asking a question.
I don't believe blogger.com lets you upload external files such as .css or .js files to your account. However, if you have access to another web host (ie: Geocities), you can upload those files to that account, then inside your blogger.com page, reference them:
Code:
<link rel="stylesheet" type="text/css" href="http://myotheraccount.com/jqueryslidemenu.css" />
<!--[if lte IE 7]>
<style type="text/css">
html .jqueryslidemenu{height: 1%;} /*Holly Hack for IE7 and below*/
</style>
<![endif]-->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
<script type="text/javascript" src="http://myotheraccount.com/jqueryslidemenu.js"></script>
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