Souci de customization php d'une ligne de formulaire

j’ai ajouté une image-lien en haut qui au clic ouvre une nouvelle page qui est un formulaire standard

<?php
$Get_url = "[http://]" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']; ?>

<p>    <a href="form-correction-addition.php" target="_blank"><img border="0" src="form-correction-addition.png" alt="form tool" width="10" onMouseOver="this.title='test form'" OnMouseOut="this.title=''"></a></p>[/code]
Mon formulaire est tout ce qui a de plus standard, mais pour rester concret, je copie son triple code inséré dans 3 sections de ma page cible

Section 1
[code]<?php
$color_font_warn="#FF0000";
$color_form_warn="#FFCC66";
if(isset($_POST['submit'])){
 $erreur="";
 while(list($var,$val)=each($_POST)){
 if(!is_array($val)){
  $$var=strip_tags($val);
 }else{
  while(list($arvar,$arval)=each($val)){
    $$var[$arvar]=strip_tags($arval);
   }
  }
 }
 $f_1=strip_tags(trim($f_1));
 $f_2=trim(ucwords(eregi_replace("[^a-zA-Z0-9éèàäö\ -]", "", $f_2)));
 $f_3=strip_tags(trim($f_3));
 // Verification des champs
 if(strlen($f_2)<2){
  $erreur.="<li><span class='txterror'>Le champ « Nom, prénom » est vide ou incomplet.</span>";
  $errf_2=1;
 }
 if(strlen($f_3)<2){
  $erreur.="<li><span class='txterror'>Le champ « E-Mail » est vide ou incomplet.</span>";
  $errf_3=1;
 }else{
  if(!ereg('^[-!#$%&\'*+\./0-9=?A-Z^_`a-z{|}~]+'.
  '@'.
  '[-!#$%&\'*+\/0-9=?A-Z^_`a-z{| }~]+\.'.

  '[-!#$%&\'*+\./0-9=?A-Z^_`a-z{
|}~]+$',
  $f_3)){
   $erreur.="<li><span class='txterror'>La syntaxe de votre adresse e-mail n'est pas correcte.</span>";
   $errf_3=1;
  }
 }
 if($erreur==""){
  // Création du message
  $titre="Message de votre site";
  $tete="From:Site@Aaa.org\n";
  $corps.="Sujet URL : ".$f_1."\n";
  $corps.="Nom, prénom : ".$f_2."\n";
  $corps.="E-Mail : ".$f_3."\n";
  $corps.="Titre1 : ".$f_4."\n";
  if(mail("contact@aaa.org", $titre, stripslashes($corps), $tete)){
   $ok_mail="true";
  }else{
   $erreur.="<li><span class='txterror'>Une erreur est survenue lors de l'envoi du message, veuillez refaire une tentative.</span>";
  }
 }
}
?>

<style type="text/css" media="screen"><!--
INPUT { color: #000; font-size: 11px; font-family: verdana, Arial, Helvetica, Geneva, Swiss, SunSans-Regular; background-color: #EEEEEE }
SELECT { color: #000; font-size: 11px; font-family: verdana, Arial, Helvetica, Geneva, Swiss, SunSans-Regular; background-color: #EEEEEE }
TEXTAREA { color: #000; font-size: 11px; font-family: verdana, Arial, Helvetica, Geneva, Swiss, SunSans-Regular; background-color: #EEEEEE }
.txterror { color: black; font-size: 11px; font-family: Verdana, Arial, Helvetica, Geneva, Swiss, SunSans-Regular }
.txtform { color: black; font-size: 12px; font-family: Verdana, Arial, Helvetica, Geneva, Swiss, SunSans-Regular }
--></style>

<? if($ok_mail=="true"){ ?>
 <table width='100%' border='0' cellspacing='1' cellpadding='1'>
  <tr><td><span class='txtform'>Le message ci-dessous nous a bien été transmis, et nous vous en remercions.</span></td></tr>
  <tr><td> </td></tr>
  <tr><td><tt><?echo nl2br(stripslashes($corps));?></tt></td></tr>
  <tr><td> </td></tr>
  <tr><td><span class='txtform'>Nous allons y donner suite dans les meilleurs délais.<br>A bientôt.</span></td></tr>
 </table>
<? }else{ ?>
<form action='<? echo $PHP_SELF ?>' method='post' name='Form'>
<table width='100%' border='0' cellspacing='1' cellpadding='1'>
<? if($erreur){ ?><tr><td colspan='2' bgcolor='red'><span class='txterror'><font color='white'><b> ERREUR, votre message n'a pas été transmis</b></font></span></td></tr><tr><td colspan='2'><ul><?echo$erreur?></ul></td></tr><?}?>
<tr><td colspan='2'><span class='txterror'>Les champs marqué d'un * sont obligatoires</span></td></tr>
<tr><td align='right' width='30%'><span class='txtform'>Sujet URL :</span></td><td><input type='text' style='width:200 <?if($errf_1==1){print("; background-color: ".$color_form_warn."; color: ".$color_font_warn);}?>;' name='f_1' value='<?if($submit){echo stripslashes($f_1);}else{print("[http://]");}?>' size='24' border='0'></td></tr>
<tr><td align='right' width='30%'><span class='txtform'>Nom, prénom* :</span></td><td><input type='text' style='width:200 <?if($errf_2==1){print("; background-color: ".$color_form_warn."; color: ".$color_font_warn);}?>;' name='f_2' value='<?echo stripslashes($f_2);?>' size='24' border='0'></td></tr>
<tr><td align='right' width='30%'><span class='txtform'>E-Mail* :</span></td><td><input type='text' style='width:200 <?if($errf_3==1){print("; background-color: ".$color_form_warn."; color: ".$color_font_warn);}?>;' name='f_3' value='<?echo stripslashes($f_3);?>' size='24' border='0'></td></tr>
<tr><td align='right' width='30%'><span class='txtform'>Titre1 :</span></td><td><textarea style='width:360 <?if($errf_4==1){print("; background-color: ".$color_form_warn."; color: ".$color_font_warn);}?>;' name='f_4' rows='6' cols='40'><?echo$f_4?></textarea></td></tr>
<tr><td align='right' width='30%'></td><td><input type='submit' name='submit' value='Envoyer' border='0'></td></tr>
</table>
</form>
<? } ?>

<p>    <a href="form-correction-addition.php" target="_blank"><img border="0" src="form-correction-addition.png" alt="form tool" width="10" onMouseOver="this.title='test form'" OnMouseOut="this.title=''"></a></p>

<p>    <a href="form-correction-addition.php?unevariable=qqchose" target="_blank"><img border="0" src="form-correction-addition.png" alt="form tool" width="10" onMouseOver="this.title='test form'" OnMouseOut="this.title=''"></a></p>

<?php
//récupération de la variable GET
$unevariable = !empty($_GET['unevariable']) ? $_GET['unevariable'] : '';


// on l'affiche par exemple
echo "unevariable  : " . $unevariable ;

<p> <a href="form-correction-addition.php?copyURL=jordan" target="_blank"><img border="0" src="form-correction-addition.png" alt="form tool" width="10" onMouseOver="this.title='test form'" OnMouseOut="this.title=''"></a></p>

<?php session_start(); 
if ($_SESSION["MEMBRE"]!="oui") header("Location: http://www.aaa.org");?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<p>    <a href="aa-form-correction-addition.php?copyURL=jordan" target="_blank"><img border="0" src="aa-form-correction-addition.png" alt="form tool" width="10" onMouseOver="this.title='test form'" OnMouseOut="this.title=''"></a></p><p> </p>

<?php session_start(); if ($_SESSION["MEMBRE"]!="oui") header("Location: http://www.aaa.org");?>
<?php
$copyURL = !empty($_GET['copyURL']) ? $_GET['copyURL'] : '';
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<form action='<? echo $PHP_SELF ?>' method='post' name='Form'>
<table width='100%' border='0' cellspacing='1' cellpadding='1'>
<? if($erreur){ ?><tr><td colspan='2' bgcolor='red'><span class='txterror'><font color='white'><b> ERROR, your message has not been sent.</b></font></span></td></tr><tr><td colspan='2'><ul><?echo$erreur?></ul></td></tr><?}?>
<tr><td colspan='2'><span class='txterror'>Fields marked with * are compulsory</span></td></tr>
<tr><td align='right' width='30%'><span class='txtform'>Subject page URL :</span></td><td><input type='text' style='width:200 <?php echo "copyURL  : " . $copyURL ;?>' size='24' border='0'></td></tr>
<tr><td align='right' width='30%'><span class='txtform'>Name, Surname* :</span></td><td><input type='text' style='width:200 <?if($errf_2==1){print("; background-color: ".$color_form_warn."; color: ".$color_font_warn);}?>;' name='f_2' value='<?echo stripslashes($f_2);?>' size='24' border='0'></td></tr>
<tr><td align='right' width='30%'><span class='txtform'>E-Mail* :</span></td><td><input type='text' style='width:200 <?if($errf_3==1){print("; background-color: ".$color_form_warn."; color: ".$color_font_warn);}?>;' name='f_3' value='<?echo stripslashes($f_3);?>' size='24' border='0'></td></tr>
<tr><td align='right' width='30%'><span class='txtform'>Title1 :</span></td><td><textarea style='width:360 <?if($errf_4==1){print("; background-color: ".$color_form_warn."; color: ".$color_font_warn);}?>;' name='f_4' rows='6' cols='40'><?echo$f_4?></textarea></td></tr>

<tr><td align='right' width='30%'></td><td><input type='submit' name='submit' value='Envoyer' border='0'></td></tr>

</table>
</form>

<p>    <a href="aa-form-correction-addition.php?copyURL=jordan" target="_blank"><img border="0" src="aa-form-correction-addition.png" alt="form tool" width="10" onMouseOver="this.title='test form'" OnMouseOut="this.title=''"></a></p>
<p> </p>

<?php
$copyURL = !empty($_GET['copyURL']) ? $_GET['copyURL'] : '';
?>

<tr><td align='right' width='30%'><span class='txtform'>Subject page URL :</span></td><td><input type='text' style='width:200 <?php echo "copyURL  : " . $copyURL ;?>' size='24' border='0'></td></tr>

$actual_link = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'];

<p><?php $actual_link = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF']; ?><a href="form-correction-addition.php?copyURL=<?php echo $actual_link; ?>" target="_blank"><img border="0" src="form-correction-addition.png" alt="contributions form tool" title="contributions" width="20" onMouseOver="this.title='contributions'" OnMouseOut="this.title=''"></a></p> 

<tr><td align='right' width='30%'><span class='txtform'>Subject page URL :</span></td><td><input type='text' style='width:500px' value='<?php $copyURL = !empty($_GET['copyURL']) ? $_GET['copyURL'] : ''; ?><?php echo "copyURL  : " . $copyURL ;?>' size='24' border='0'></td></tr>