Problems with plugin

Hi. I’m write plugin. My plugin is intended send information from form to tables in mysql.
When i write information field in the form and click sumbit sent, plugin nothing do.
I don’t now when is problems.

<?php

/*
	Plugin Name: PaymentRomb
	Version: 0.1
	Description: Paymnet for Romb
	Author: DoktorPress
*/
    define( 'payment_PATH', plugin_dir_path( __FILE__ ) );
    require payment_PATH.'payment/logicPayment.php';

	//register_activation_hook(__FILE__, 'payment_install'); 
	add_action('admin_menu', 'payment_menu');

	

	// serwer 
    $mysql_server = 'localhost'; 
    // admin 
    $mysql_admin = 'root'; 
    // has?o 
    $mysql_pass = 'SqlDoktor'; 
    // nazwa baza 
    $db = 'wordpress'; 
    // nawi?zujemy po??czenie z serwerem MySQL 
    @mysql_connect($mysql_server, $mysql_admin, $mysql_pass) 
    or die('Brak po??czenia z serwerem MySQL.'); 
    // ??czymy si? z baz? danych 
    @mysql_select_db($db) 
    or die('B??d wyboru bazy danych.'); 
    
 

function payment_menu() {
    add_menu_page('Payment', 'basePayment', 'administrator', 'Payment_set');
    add_submenu_page('Payment_set', __('Payment'), __('Payment'), 'edit_themes', 'Payment_settings', 'Payment_settings');
}

function Payment_settings() {
 $payment=new logicPayment();
 if (isset($_POST['Payment_settings'])) {
        foreach ($_POST['Payment_settings'] as $img) {
            $payment->add(array('zob' => $img['zob'], 'wpl' => $img['wpl'], 'n' => $img['n'],'y' => $img['y'], 'd' => $img['d'],'Wykonaj' => $img['Wykonaj']));
        }
    }
        $results = $payment->add();
	echo'<form action="?page=Payment_settings" method="post">
    <table class="list" style="width:auto;" cellpadding="10">
    <tr><td>
        $strona:
        <input type="radio" name="strona" value="zob" id="radio-zob" %{if !Access($cur_level,A_SKAW)}disabled%{/if} onclick="UpdateEkwiwalent(this);"><label for="radio-zob" accesskey="z">Zobowi?zanie</label>
        <input type="radio" name="strona" value="wpl" id="radio-wpl" %{if !Access($cur_level,A_SKAM)}disabled%{/if} onclick="UpdateEkwiwalent(this);"><label for="radio-wpl" accesskey="w">Wp?ata</label>
    </td></tr>

    <tr><td id="ekw" style="display: none;">
        Typ wp?aty: 
        <input type="radio" id="ekwn" name="ekw" value="n" checked="checked"><label for="ekwn" accesskey="1"> wp?ata</label>,
        <input type="radio" id="ekwy" name="ekw" value="y"><label for="ekwy" accesskey="2"> ekwiwalent</label>, 
        <input type="radio" id="ekwd" name="ekw" value="d"><label for="ekwd" accesskey="3"> darowizna</label>
    </td></tr>
    <tr><td>
        <label for="tytul" accesskey="t">Pole "tytu?" z przelewu</label><br /><input type="text" id="tytul" size="30" name="tytul" /><br />
        <span class="hint-small"><i>Rozpoznawane formaty:</i>&nbsp;&nbsp;<strong>1234/110,05</strong>&nbsp;&nbsp;<i>lub</i>&nbsp;&nbsp;<strong>[email protected]/110,05</strong></span>
    </td></tr>

    <tr><td>
        <label for="data_wplaty" accesskey="a">Data wp?aty</label><input type="text" id="data_wplaty" onchange="ocDataUr(this)" onkeypress="/*return okpDataUr(event, this)*/" class="data datepicker" size="8" name="data_wplaty" /><br />
        <span class="hint-small"><i>Rozpoznawany format daty:</i> DD-MM-RRRR</span>
    </td></tr>

    <tr><td>
        <input type="submit" name="$wyslij" style="float: right;" accesskey="s" value="Wykonaj">
    </td></tr>  	
 	</table>
    </form>';
}

And

<?php

class logicPayment {
public function add(){
	if(isset($_REQUEST['wyslij'])&&isset($_REQUEST['tytul'])&&isset($_REQUEST['data_wplaty'])&&isset($_REQUEST['strona'])) {
		// Walidacja stron
		$strona = $_REQUEST['strona'];
		if(!Access($lusr,A_SKAW)&&($strona=='zob'))
			die('-');
		if(!Access($lusr,A_SKAM)&&($strona=='wpl'))
			die('-');

		if(preg_match('/^([0-9]+)\\/([-]{0,1}[0-9]+,[0-9]{2})$/i',$_REQUEST['tytul'],$matches)) {
			$insData['user_id']=$matches[1];
			$insData[$strona]=preg_replace('/,/','',$matches[2]);
		}
		else if(preg_match('/^([a-zA-Z0-9._%+-]+@[^\\/]+)\\/([-]{0,1}[0-9]+,[0-9]{2})$/',$_REQUEST['tytul'],$matches)) {
			require_once('req.email.php');
			if(($insData['user_id']=CheckEmail($matches[1],$db))==0)
				die('no email found');
			$insData[$strona]=preg_replace('/,/','',$matches[2]);
		}
		
		if(isset($_REQUEST['ekw'])) {
			$insData['ekw']="'${_REQUEST['ekw']}'";
		}
		
		$insData['data_wplaty']="STR_TO_DATE('".$_REQUEST['data_wplaty']."', '%d-%m-%Y')";
		
		$insData['skarbnik'] = $lusr->user['user_id'];
		
		$idx = 0;
		foreach($insData as $key => $data) {
			$insC[$idx] = $key;
			$insD[$idx] = $data;
			$idx++;
		}
		
		$query = 'SELECT (SUM(<code>wpl</code>)-SUM(<code>zob</code>)) AS <code>saldo</code> FROM <code>wplaty</code> WHERE <code>user_id</code> = '.$insData['user_id'].' GROUP BY <code>user_id</code>';
		$rset = mysql_query($query,$db) OR die('#1 '.mysql_error($db));
		$row = mysql_fetch_assoc($rset);
		mysql_free_result($rset);
		if(!$row)
			$row = array('saldo' => 0);
		
		if($strona=='zob')
			$row['saldo'] -= $insData['zob'];
		else
			$row['saldo'] += $insData['wpl'];

		// Zapisz w bazie.
		$query = 'INSERT INTO <code>wplaty</code> ('.implode(',',$insC).',<code>stan_saldo</code>) VALUES('.implode(',',$insD).','.$row['saldo'].')';
		mysql_query($query,$db) OR die('#2 '.mysql_error($db));

		// Wy?lij email
		if($strona=='wpl') {
			$tUser = new User($insData['user_id']);
			$email_subject = $cfg['msg']['odnotowanawplata_subject'];
			
			$typWplaty = '';

			switch($_REQUEST['ekw']) {
			case "n": $typWplaty = 'wp?ata'; break;
			case "y": $typWplaty = 'ekwiwalent'; break;
			case "d": $typWplaty = 'darowizna'; break;
			}
			
			$email_body = preg_replace(array('/%KWOTA%/','/%TYP%/'), array(money_format('%!i', $insData['wpl'] / 100),$typWplaty), $cfg['msg']['odnotowanawplata_body']);
			$sem->SendEmail($tUser->user['email'],$tUser->user['imie'].' '.$tUser->user['nazwisko'],$email_subject,$email_body,true);
		}
	}

}
}

I think that is must stupid problem.

Thanks ??