My guess is that this is basic HTTP authentication. In that case, use the credentials() method on your WWW::Mechanize object to tell it what login and password to use. 

my $mech = WWW::Mechanize->new();
$mech->credentials( 'login', 'password' );
# further $mech usage

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In reply to Re: Help: populate login password into a popup window of a website by kyle
in thread Help: populate login password into a popup window of a website by neoanantha

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