Hello , I am creating a front end to manage the tables.Here is my problem.I send data across as hidden fields.The forward path works fine.but when i click on go back to previous page and choose a different option, it actually remember the previous values.I have no clue why..could anyone help by looking into my code?

#!/usr/bin/perl
use DBI;
use CGI qw(:standard);                          # indicates that this 
+program requires CGI module to run,to load it
use CGI::Session ( '-ip_match' );

print "Content-type:text/html\n";          # prints the html header fo
+r the page based on login
print "Pragma: no-cache", "\n\n";


my $cgi=CGI->new();

$sid = param("session_id");
$usr=param("uid");
$lgn=param("login");

if ($lgn == 1){
print $cgi->start_html(
-title => "Main Menu",
-bgcolor=> "#003399",

);
print "<font color=\"#FFFDCC\"><CENTER> <CENTER> <h1>Company</h1><br><
+hr><br><br><br>";

print $cgi-> start_form({      ## starts a new form that would call ad
+dusr.pl
-action => "alterDSDB.pl",
-method => "POST",
});
&hidden_fields();
print $cgi->hidden(
-name => "type",
-value => "PDF"
);
print $cgi->submit({
-name => "alterDSDB",
-value => "Alter PDF",
});
print $cgi->end_form();
print "<br>";
print $cgi-> start_form({      ## starts a new form that would call ad
+dusr.pl
-action => "alterDSDB.pl",
-method => "POST",
});
&hidden_fields();
print $cgi->hidden(
-name => "type",
-value => "ASCII"
);
print $cgi->submit({
-name => "alterDSDBA",
-value => "Alter ASCII",
});
print $cgi->end_form();
print "<br>";
if ($usr eq "admin"){
#-------------------------------#
print $cgi-> start_form({      ## starts a new form that would call ad
+dusr.pl
-action => "alterDSDBUSR.pl",
-method => "POST",
});
&hidden_fields();
print $cgi->submit({
-name => "alterDSDBUSR",
-value => "   Manage Users   ",
});
print $cgi->end_form();
print "<br>";
}
#-------------------------------#
print $cgi-> start_form({      ## starts a new form that would call ad
+dusr.pl
-action => "logout.pl",
-method => "POST",
});
&hidden_fields();
print $cgi->submit({
-name => "logoutDSDB",
-value => "    Logout    ",
});
print $cgi->end_form();

#-------------------------------#
print "<br><br><br><hr> Please wait .Don\'t use the browser\'s buttons
+ to move back and forth.</CENTER><br>";
print $cgi->end_html();
}
else {
print $cgi->start_html(
-title => "Main Menu",
-bgcolor=> "#003399",

);
print "<font color=\"#FFFDCC\"><CENTER> <CENTER> <h1> Company</h1><br>
+<hr><br><br><br>";
print "<h2> You are not logged in.Session expired.<br>Log in again</h2
+><br>";
$sid = undef;
$uid = undef;
$lgn = undef;
&hidden_fields();
#-------------------------------#
print $cgi-> start_form({      ## starts a new form that would call ad
+dusr.pl
-action => "loginDb.pl",
-method => "POST",
});
&hidden_fields();
print $cgi->submit({
-name => "Login",
-value => "Go to Login Page",
});
print $cgi->end_form();
print "<br><br><br><hr> Please wait .Don\'t use the browser\'s buttons
+ to move back and forth.</CENTER><br>";
print $cgi->end_html();

         }

sub hidden_fields(){
print $cgi->hidden(
-name => "session_id",
-value => $sid
);

print $cgi->hidden(
-name => "uid",
-value => $authuser
);

print $cgi->hidden(
-name => "login",
-value => 1
);
}

sub hidden_fields(){
print $cgi->hidden(
-name => "session_id",
-value => $sid
);

print $cgi->hidden(
-name => "uid",
-value => $authuser
);

print $cgi->hidden(
-name => "login",
-value => 1
);
}
[download]

And the second page

#!/usr/bin/perl
use DBI;
use CGI qw(:standard);                          # indicates that this 
+program requires CGI module to run,to load it
use CGI::Session ( '-ip_match' );

print "Content-type:text/html\n";          # prints the html header fo
+r the page based on login
print "Pragma:no-cache", "\n\n";

#$session = CGI::Session->load();
my $cgi=CGI->new();
#my $lgn=$session->param("user");
#print "user : $lgn\n";
$sid = param("session_id");
$usr=param("uid");
$lgn=param("login");
$type=param("type");
#print "Login :$lgn\t$usr\n";
if ($lgn == 1){
print $cgi->start_html(
-title => "Main Menu",
-bgcolor=> "#003399",
#-cookie=> $cookie
);
print "<font color=\"#FFFDCC\"><CENTER> <CENTER> <h1> Company</h1><br>
+<hr><br>";
print "$type<br>";
print $cgi->start_form(
-method =>"post",
-action =>"doinsertdsdb.pl"
);
print $cgi->hidden(
-name => "type",
-value => $type
);
&hidden_fields();
print "<br>";
print $cgi->submit(
-name => "Submit",
-value =>"Insert"
);
print $cgi->end_form();
print $cgi->start_form(
-method =>"post",
-action =>"dodeletedsdb.pl"
);
print $cgi->hidden(
-name => "type",
-value => $type
);
&hidden_fields();
print "<br>";
print $cgi->submit(
-name => "Submit",
-value =>"Delete"
);
print $cgi->end_form();
print $cgi->start_form(
-method =>"post",
-action =>"doupdatedsdb.pl"
);
print $cgi->hidden(
-name => "type",
-value => $type
);
&hidden_fields();
print "<br>";
print $cgi->submit(
-name => "Submit",
-value =>"Update"
);
print $cgi->end_form();
print $cgi->start_form(
-method =>"post",
-action =>"dsdb_menu.pl"
);
print $cgi->hidden(
-name => "type",
-value => ""
);
&hidden_fields();
print "<br>";
print $cgi->submit(
-name => "Submit",
-value =>"Back to Main Menu"
);
print $cgi->end_form();


print "<br><br><br><hr>Don\'t use the browser\'s buttons to move back 
+and forth.</CENTER><br>";
print $cgi->end_html();

         }
else{
print $cgi->start_html(
-title => "Main Menu",
-bgcolor=> "#003399",
#-cookie=> $cookie
);
print "<font color=\"#FFFDCC\"><CENTER> <CENTER> <h1> Company </h1><br
+><hr><br><br><br>";
print "<h2> You are not logged in.Session expired.<br>Log in again</h2
+><br>";
$sid = undef;
$uid = undef;
$lgn = undef;
&hidden_fields();
#-------------------------------#
print $cgi-> start_form({      ## starts a new form that would call ad
+dusr.pl
-action => "loginDb.pl",
-method => "POST",
});
&hidden_fields();
print $cgi->submit({
-name => "Login",
-value => "Go to Login Page",
});
print $cgi->end_form();
print "<br><br><br><hr> Please wait .Don\'t use the browser\'s buttons
+ to move back and forth.</CENTER><br>";
print $cgi->end_html();

         }

sub hidden_fields(){
print $cgi->hidden(
-name => "session_id",
-value => $sid
);

print $cgi->hidden(
-name => "uid",
-value => $authuser
);

print $cgi->hidden(
-name => "login",
-value => 1
);
}
[download]

Thanks