use Win32::IEAutomation;
use Win32::IEAutomation::WinClicker;

my $clicker1 =Win32::IEAutomation::WinClicker->new(warnings => 1);
#-----------------------------------------------------------
code for filling other input fields of form.
#------------------------------------------------------------


my $title="Message from webpage";

$ie->getButton('caption:', "Submit",1)->Click;
$clicker1->alert_ok($title);