or download this
$mech->set_fields(
'ctl00$ContentPlaceHolder1$ctl00$rcbusertype_Input' => "Su
+bscriber",
'ctl00$ContentPlaceHolder1$ctl00$txtUserName' => $un,
...
my $response = $mech->click_button( name => 'ctl00$ContentPlaceHolder1
+$ctl00$LoginButton',
x=>26,
y=>10);