et voila le code
<body>
<table width="500" border="0" cellspacing="0" cellpadding="0">
<form action="envoi.php" method="post" enctype="multipart/form-data" name="formulaire">
<tr>
<td colspan="3">Envoyer un message</td>
</tr>
<tr>
<td><div align="right">Votre nom</div></td>
<td colspan="2"><input type="text" name="nom" size="45" maxlength="100"></td>
</tr>
<tr>
<td width="17%"><div align="right">Votre mail</div></td>
<td colspan="2"><input type="text" name="mail" size="45" maxlength="100"></td>
</tr>
<tr>
<td><div align="right">Sujet :</div></td>
<td colspan="2"><p>
<input type="text" name="objet" size="45" maxlength="120">
</p>
<p></td>
<td width="17%" rowspan="2" class="lasaisie">
</tr>
<tr>
<td height="44" colspan="3"><html>
<body>
<form enctype="multipart/form-data" action="fileupload.php" method="post">
<input type="hidden" name="MAX_FILE_SIZE" value="100000" />
Transfère le fichier <input type="file" name="monfichier" />
<input type="submit" />
</form>
</body>
</html>
</td>
</tr>
<tr>
<td align='left' class="lasaisie">
<p></p></td>
</tr>
<tr>
<td><div align="right">Message :</div></td>
<td colspan="2"><textarea name="message" cols="50" rows="10"></textarea></td>
</tr>
<tr>
<td></td>
<td width="42%"><center>
<input type="reset" name="Submit" value="Réinitialiser le formulaire">
</center></td>
<td width="24%"><center>
<input type="submit" name="Submit" value="Envoyer">
</center></td>
</tr>
<tr>
<td></td>
<td> </td>
<td> </td>
</tr>
</form>
</table>
</body>
</html>