passing and using param

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

I want to execute a perl script and pass a parameter. In the script, I want to capture the parameter (and validate it). If not valid, then I will handle by printing a message and exiting. I have read similar petitions and suggestions and tried them, but cannot get it to work (HELP!). See below for a code snippet:

 
#make the call:
http://www.test.com/myscript.cgi?id=1234
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***Below is the snippet from myscript.cgi: 

#!/usr/bin/perl -w
print "Content-type: text/html\n\n"; 
$myvalue = param("test");   print "<HTML>\n";
   print "<BODY BGCOLOR=#FFFFFF>\n";
   print "<CENTER>\n";
   print "myvalue: $myvalue";
   print "</CENTER>\n";
   print "</BODY></HTML>";
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