my($webcrawler, $hook, $url, $response, $structure) = @_; 

##</code><code>##

$webcrawler = @_;
$hook=@_;
.
.
.
$structure=@_;

##</code><code>##

($webcrawler, $hook, $url, $response, $structure) = @_; 

##</code><code>##

$webcrawler = $_[0];
$hook       = $_[1];
$url        = $_[2];
$response   = $_[3];
$structure  = $_[4];