From 'perldoc CGI':

Pass the param() method a single argument to fetch the
value of the named parameter. If the parameter is
multivalued (e.g. from multiple selections in a scrolling
list), you can ask to receive an array.  Otherwise the
method will return a single value.
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update: D'oh! Oh well. Btw, CGI::param detects if you want an array or a scalar by checking the wantarray function. Check it out, it's nifty.

[ar0n]