in reply to 2 script in a page

You might consider using SSI for this. 
<html>
<body>
<div style="float: left" class="sidebar">
<!--#include virtual="/cgi-bin/build-sidebar" -->
</div>

<!--#include virtual="/cgi-bin/build-body" -->
</body></html>

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The advantage of this approach is that you aren't limiting yourself to using CGI to generate your page body. You could put a static piece of HTML content in there just as easily.

In Section Seekers of Perl Wisdom