Help in Validating Form

[Ckaringa]

Hey guyz? I am a newbie in php and have managed to create a website using php though spam bots have been sending me blank emails since the form is not validated. i have tried to validate it but i have not succeed. kindly assist. Below is the code of the contacts form. Thanks

<style type="text/css">
<!--
.insid {font-family: Tahoma;

    font-size: 11px;

    color: #003366;

    font-weight: bold;

}
-->
TD.error
        {
            color: red;
            font-weight: bold;    
        }

</style>

<?php
if (count($errors) > 0)
    echo "<p>There were some errors in your submitted form, please correct them and try again.</p>";
?>

To contact us kindly please fill in the form below.<br />
Please take time to send us your views, comments, suggestions or complaints:
<form action="sendmail.php" method="POST" name="contact" id="contact">
  <table width="98%" border="0" align="center" cellpadding="4" cellspacing="3" bgcolor="#FFFFFF">
    <tr>
      <td width="28%"><div align="right"></div></td>
      <td width="72%" valign="top"><div align="left"><strong>Menengai Holidays Ltd</strong><br />
        P.O. Box 2260 - 00202, KNH,<br />
        Nairobi, Kenya<br />
        First Floor, Duplex Apartments,<br />
        Bunyala/Lower Hill Road, Upper Hill<br />
        Tel No: +254 &ndash; 20- 2733702<br />
        Fax No: +254 &ndash; 20 &ndash; 2725021<br />
        Cell: +254 &ndash; 720&ndash; 950500<br />
          <strong>Email:</strong> 



<?php

function hideemail($email) {
$mail = "";
for ($i = 0; $i < strlen($email); $i++) {
$mail .= '&#' . ord($email{$i}) . ';';
}
return $mail;
}

echo hideemail("[e-mail]"); ?> </div></td>
    </tr>
    <tr>
      <td><div align="right"></div></td>
      <td valign="top"><div align="left"><strong>US Office Contacts:</strong><br />
10418 Pickerel Lane, <br />
Charlotte, NC 28213 <br />
Tel: [phone] <br />
        <b>Email:</b> <strong style="font-weight: 400">[e-mail]</strong> </div></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td><div align="left"><font size='2' color='#ff0000'>*</font> Denotes Required fields. </div></td>
    </tr>
    <tr>
      <td colspan="2"><div align="left"><?php  include_once( "20090106-76ee.lib.php" ); ?>
    <style type='text/css'>
        .form_title{
            color : #000000;
            font-size: 13px;
            font-family: verdana, Geneva, Arial, Helvetica, sans-serif;
            font-weight : bold;
        }

        .form_field {
            font-size : 13px;
            font-family : Verdana, Arial, Helvetica, sans-serif;
            color : #474747;
            font-weight : bold;
            text-align:left;
        }

        .form_text{
            font-size : 11px;
            font-family : Verdana, Arial, Helvetica, sans-serif;
            color : #000000;
        }

        .text_box{
            font-size : 11px;
            font-family : Verdana, Arial, Helvetica, sans-serif;
            color : #000000;
            width:200px;
        }

        .text_area{
            font-size : 11px;
            font-family : Verdana, Arial, Helvetica, sans-serif;
            color : #000000;
            width:200px;
            height:60px;
        }

        .text_select{
            font-size : 11px;
            font-family : Verdana, Arial, Helvetica, sans-serif;
            color : #000000;
        }

        .form_error{
            font-size : 11px;
            font-family : Verdana, Arial, Helvetica, sans-serif;
            color : #ff0000;
            font-weight : bold;
        }

        .copyright{
            font-size : 11px;
            font-family : Verdana, Arial, Helvetica, sans-serif;
            color : #000000;
        }

    </style>
<?php
    if( !$isHideForm ): 
        global $sErr ;
        if( $sErr ) print "<br><a name='error'></a><center><font class='form_error' >$sErr</font></center><br>"; 

        $starColor = $sErr ? "#ff0000" : "#000000";
        $style=" class='form_text' ";

 ?>
<?php
    if (count($errors) > 0)
        echo "<p>There were some errors in your submitted form, please correct them and try again.</p>";
    ?>
<form name="frmFormMail" action="<?php print PHP_SELF ?>" method='post' enctype='multipart/form-data'>
<input type='hidden' name='formmail_submit' value='Y'>
<input type='hidden' name='esh_formmail_recipient' value="[e-mail]">
<input type='hidden' name='esh_formmail_subject' value="New Inquiry">
<input type='hidden' name='esh_formmail_cc' value="">
<input type='hidden' name='esh_formmail_bcc' value="">
<input type='hidden' name='esh_formmail_return_subject' value="Thank you for contacting us.">
<input type='hidden' name='esh_formmail_return_msg' value="Hi,

We have received your email and we will get back to you shortly. Thanks in advance.

Regards,

Menengai Holidays">
<input type='hidden' name='esh_formmail_mail_and_file' value="">
<input type='hidden' name='esh_formmail_charset' value="">

<table cellspacing='16' cellpadding='0' border='0'  >
    <tr>
        <td class="form_field" valign='top' align='right'>Full Names: </td><td width='10'  aligh='right' valign='top'> <font size='2' color='#ff0000'>*</font> </td>
        <td class="form_text">
<input type="text" name="Full_Names"  value="<?php  print HtmlSpecialChars( $HTTP_POST_VARS[ "Full_Names" ] ); ?>" class='text_box'>
<td class="error"><?= $errors['Full_Names'] ?></td>
        </td>
    </tr>

    <tr>
        <td class="form_field" valign='top' align='right'>E-mail </td><td width='10'  aligh='right' valign='top'> <font size='2' color='#ff0000'>*</font> </td>
        <td class="form_text">
<input type="sender's email" name="E-mail"  value="<?php  print HtmlSpecialChars( $HTTP_POST_VARS[ "E-mail" ] ); ?>" class='text_box'>
<td class="error"><?= $errors['E-mail'] ?></td>

        </td>
    </tr>

    <tr>
        <td class="form_field" valign='top' align='right'>Country: </td><td width='10'  aligh='right' valign='top'></td>
        <td class="form_text">
<input type="text" name="Country"  value="<?php  print HtmlSpecialChars( $HTTP_POST_VARS[ "Country" ] ); ?>" class='text_box'>
        </td>
    </tr>

    <tr>
        <td class="form_field" valign='top' align='right'>Subject: </td><td width='10'  aligh='right' valign='top'></td>
        <td class="form_text">
<input type="text" name="Subject"  value="<?php  print HtmlSpecialChars( $HTTP_POST_VARS[ "Subject" ] ); ?>" class='text_box'>
        </td>
    </tr>

    <tr>
        <td class="form_field" valign='top' align='right'>Message: </td><td width='10'  aligh='right' valign='top'></td>
        <td class="form_text">
<textarea name="Message" rows=4 cols=25 ><?php  print HtmlSpecialChars( $HTTP_POST_VARS[ "Message" ] ); ?></textarea>
<td class="error"><?= $errors['Message'] ?></td>
        </td>
    </tr>
    <tr><td colspan=3 align='center'><input type='submit' value='Submit'> &nbsp;&nbsp; <input type='button' value='Cancel' onClick="location.href='/';"></td></tr>
</table>
</form>
<!-- =======================  End:  ======================= -->
<?php
        if( $sErr ) print "<script language='javascript' type='text/javascript'>location.href='#error';</script>";;; 

else: //!$isHideForm
    print( "<br><br><hr><center><b>Your form has been sent. Thank you.</b><br><br><input type='button' value='Home' onclick=\"location.href='/';\"></center><br><br>" );
endif; //!$isHideForm
            ?>
    <!-- -------------------------------------- COPY RIGHT -------------------------------------- -->
</div></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td><div align="left"><strong> <a href="index.php?mod=15"> Click     here</a></strong> to view our General Terms and Conditions</div></td>
    </tr>
  </table>
</form>