Let me expand on that a little. It appears to me that you are using the funcional interface to a module as opposed to the object oriented version. If this is a CGI script and you are tring to call param from CGI.pm the following is needed.
use CGI qw(:standard);
This imports the most common functions from CGI.pm including param(). If you are using a different module please post a follow-up with more of your code.
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