Well, I think you forgot use CGI;
Your code would look (untested):
#!/usr/bin/perl -w
use strict;
use CGI qw/:standard/;
print header;
my $myvalue = param("test");
print <<EOS;
<BODY BGCOLOR=#FFFFFF>
<CENTER>
myvalue: $myvalue
</CENTER>
</BODY></HTML>
EOS
Note that I have replaced a bunch of your print statements by using a HEREDOC syntax. Of course, you can do it with a few prints, but it very much neater this way. Oh, and you might want to use built in CGI functions for generating HTML.. For all your CGI needs, consult CGI manual.
...And don't forget to use strict ;)
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