Formulář na odeslání mailu - kódování

<?php

$where_form_is=".strrev(strstr(strrev($_SERVER['PHP_SELF']),"/].strrev(strstr(strrev($_SERVER['PHP_SELF']),"/]http://".$_SERVER['SERVER_NAME'].strrev(strstr(strrev($_SERVER['PHP_SELF']),"/"));

session_start();
if( ($_SESSION['security_code']==$_POST['security_code']) && (!empty($_POST['security_code'])) ) { 
mail("XY@seznam.cz","Online mail","Vyplnili jste následující údaje:

Item: " . $_POST['field_1'] . " 
Name: " . $_POST['field_2'] . " 
E-mail: " . $_POST['field_3'] . " 
Phone: " . $_POST['field_4'] . " 
Hotel address: " . $_POST['field_5'] . " 
Tour date: " . $_POST['field_6'] . " 
Time: " . $_POST['field_7'] . " 
Adults: " . $_POST['field_8'] . " 
Students: " . $_POST['field_9'] . " 
Language: " . $_POST['field_10'] . " 
Requirements: " . $_POST['field_11'] . " 

");

include("confirm.html");
}
else {
echo "Invalid Captcha String.";
}

?>

<div id="mainForm">
                   
<BR/><!-- begin form -->
<form method=post enctype=multipart/form-data action=processor.php onSubmit="return validatePage1();"><ul class=mainForm id="mainForm_1" accept-charset="utf-8">

                <li class="mainForm" id="fieldBox_1">
                    <label class="formFieldQuestion">Tour:&nbsp;*</label><select class=mainForm name=field_1 id=field_1><option value=''></option><option value="TOUR 6">TOUR 6</option><option value="TOUR 5">TOUR 5</option><option value="TOUR 4">TOUR 4</option><option value="TOUR 3">TOUR 3</option><option value="TOUR 2">TOUR 2</option><option value="TOUR 1">TOUR 1</option></select></li>

                <li class="mainForm" id="fieldBox_2">
                    <label class="formFieldQuestion">Name: &nbsp;*</label><input class=mainForm type=text name=field_2 id=field_2 size='20' value=''></li>

                <li class="mainForm" id="fieldBox_3">
                    <label class="formFieldQuestion">E-mail:&nbsp;*</label><input class=mainForm type=email name=field_3 id=field_3 size=25 value=""></li>

                <li class="mainForm" id="fieldBox_4">
                    <label class="formFieldQuestion">Phone:&nbsp;*</label><input class=mainForm type=phone name=field_4 id=field_4 size=24 value=""></li>

                <li class="mainForm" id="fieldBox_5">
                    <label class="formFieldQuestion">Hotel address:&nbsp;*&nbsp;<a class=info href=#><img src=imgs/tip_small.png border=0><span class=infobox>We will pick up you from your hotel. Pick-up time will be confirmed immediately.</span></a></label><input class=mainForm type=text name=field_5 id=field_5 size='50' value=''></li>

                <li class="mainForm" id="fieldBox_6">
                    <label class="formFieldQuestion">Tour date:&nbsp;*</label><input type=text  name=field_6 id=field_6 value=""><button type=reset class=calendarStyle id=fieldDateTrigger_6></button><SCRIPT type='text/javascript'>   Calendar.setup({
                                inputField     :    "field_6",   
                                ifFormat       :    "%m/%d/%Y",   
                                showsTime      :    false,          
                                button         :    "fieldDateTrigger_6",
                                singleClick    :    true,           
                                step           :    1                
                                });</SCRIPT></li>

                <li class="mainForm" id="fieldBox_7">
                    <label class="formFieldQuestion">Time:&nbsp;*</label><select class=mainForm name=field_7 id=field_7><option value=''></option><option value="10:00">10:00</option></select></li>

                <li class="mainForm" id="fieldBox_8">
                    <label class="formFieldQuestion">Number of people:</label></li>
          
        <li class="mainForm1" id="fieldBox_8">
                    <label class="formFieldQuestion">Adults:</label><input class=mainForm type=text name=field_8 id=field_8 size='5' value=''></li>
        
                <li class="mainForm" id="fieldBox_9">
                    <label class="formFieldQuestion">&nbsp;&nbsp;Children up to 12 years / students:</label><input class=mainForm type=text name=field_9 id=field_9 size='5' value=''></li>

                <li class="mainForm" id="fieldBox_10">
                    <label class="formFieldQuestion">Language:&nbsp;*</label><select class=mainForm name=field_10 id=field_10><option value=''></option><option value="English">English</option><option value="Deutsch">Deutsch</option><option value="Italiano">Italiano</option><option value="Español">Español</option><option value="Français">Français</option><option value="По-русски">По-русски</option></select></li>

                <li class="mainForm" id="fieldBox_11">
                    <label class="formFieldQuestion">Special requirements:</label><input class=mainForm type=text name=field_11 id=field_11 size='65' value=''></li>
<!-- end of this page -->

</div>