FiverrScript

i need some help to login to FiverrScript i want to login to FiverrScript i use perl to login to this website i have problem with post data in order to enter user +password i find that when i enter user +password website post data :
l_username=user&l_password=pass&jlog=1&r=
how can i write this ?i started to write :

#!/usr/bin/perl -w

use strict;
use LWP::UserAgent;
use HTTP::Cookies;

my ($user,$passwd) =("user","pass");

my $base_url = 'http://www.speedbuy.biz/login';



my ($eventTarget,$eventArg,$viewState,$viewStateEnc);
				  
    require HTTP::Request;
	my $ua = LWP::UserAgent->new(agent =>'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.0)');
	push @{ $ua->requests_redirectable }, 'POST';
	$ua->cookie_jar(new HTTP::Cookies);

=head
	# step 1 , let login first
			my %hash;
			   $hash{url} = $base_url;
			   $hash{'ctl00$ContentPlaceHolder$txtUserName'}    =  $user;
			   $hash{'ctl00$ContentPlaceHolder$txtPassword'}    =  $passwd;
			   $hash{'__EVENTTARGET'}    ='';
			   $hash{'__EVENTARGUMENT'}  ='';
			   $hash{'__VIEWSTATE'}      ='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';
			   $hash{'__EVENTVALIDATION'}='/wEWDgLUzp+oAwKakcPUBQKRxK3XAwKU0oSGDgLy2vWbAQLI1Jf6BwL2tL7ZCgKgwMH8CgKtkrb8BQLDwYfLBwK/mL/gDAL5iIb2CQLEi6D8CgLkjZuNByNup0E9oOmJnEHYSKDFQagbSQQ9';
			   $hash{'ctl00$ContentPlaceHolder$btnLogin'} ='Login';
=cut
			   my $content;# = &posturl(%hash);##ok logged in

Code (markup):

 

there should be config file to setup login credentials ...look in ../inlcude/ folder if there is any