Désolé d'avoir paru comme il vous a semblé m'apparaître, j'avais dit ca par désespoir, mais je te remercie Bultez de m'avoir appris cette leçon

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Je joins ici mon formulaire afin que vous puissiez y voir plus clair dans mon charabia.
Le problème est que je n'avais jamais fait du javascript auparavant et que mon boss m'impose ça à la volée... Ca met la pression.
<form name="form1" id="monform" method="post" action="recapitpro.php?valid=true" >
<table width="470" border="0" cellpadding="2" cellspacing="4">
<tr>
<td width="150">Civilité<span class="Style1">*</span>:</td>
<td width="300">
<div align="right">
<select name="lstCiv" id="lstCiv">
<option value="0"></option>
<option>Melle</option>
<option>Mme</option>
<option>M</option>
</select>
</div></td>
</tr>
<tr>
<td>Nom<span class="Style1">*</span>:</td>
<td><div align="right">
<input name="txtNom" type="text" id="txtNom" size="35" maxlength="35">
</div></td>
</tr>
<tr>
<td>Prénom<span class="Style1">*</span></td>
<td><div align="right">
<input name="txtPnom" type="text" id="txtPnom" size="45" maxlength="45">
</div></td>
</tr>
<tr>
<td>Enseigne/Elevage<span class="Style1">*</span>: </td>
<td><div align="right">
<input name="txtEnseigne" type="text" id="txtEnseigne" size="45" maxlength="45">
</div></td>
</tr>
<tr>
<td>Adresse<span class="Style1">*</span>:</td>
<td><div align="right">
<input name="txtAdr" type="text" id="txtAdr" size="50" maxlength="70">
</div></td>
</tr>
<tr>
<td>Code postal<span class="Style1">*</span>: </td>
<td><div align="right">
<input name="txtCP" type="text" id="txtCP" size="10" maxlength="5">
</div></td>
</tr>
<tr>
<td>Ville<span class="Style1">*</span>:</td>
<td><div align="right">
<input name="txtVille" type="text" id="txtVille" size="35" maxlength="35">
</div></td>
</tr>
<tr>
<td>No. SIRET<span class="Style1">*</span> :</td>
<td><div align="right">
<input name="txtNoSiret" type="text" id="txtNoSiret" size="20" maxlength="14">
</div></td>
</tr>
<tr>
<td>Code APE<span class="Style1">*</span> :</td>
<td><div align="right">
<select name="lstApe" id="lstApe">
<option value="0"></option>
<option>012J</option>
<option>524Z</option>
</select>
</div></td>
</tr>
<tr>
<td>Affixe (si éleveur):</td>
<td><div align="right">
<input name="txtAffixe" type="text" id="txtAffixe" size="15" maxlength="10">
</div></td>
</tr>
<tr>
<td>Tél entreprise<span class="Style1">*</span>:</td>
<td><div align="right">
<input name="txtTel_Ent" type="text" id="txtTel_Ent" size="21" maxlength="21">
</div></td>
</tr>
<tr>
<td><p>Tél direct<span class="Style1">*</span>:</p></td>
<td><div align="right">
<input name="txtTel_Direct" type="text" id="txtTel_Direct" size="21" maxlength="21">
</div></td>
</tr>
<tr>
<td>Fax entreprise:</td>
<td><div align="right">
<input name="txtFax_Ent" type="text" id="txtFax_Ent" size="21" maxlength="21">
</div></td>
</tr>
<tr>
<td>Fax direct : </td>
<td><div align="right">
<input name="txtFax_Direct" type="text" id="txtFax_Direct" size="21" maxlength="21">
</div></td>
</tr>
<tr>
<td>Site web :</td>
<td><div align="right">
<input name="txtSite" type="text" id="txtSite" size="50" maxlength="70">
</div></td>
</tr>
<tr>
<td>E-mail<span class="Style1">*</span>:</td>
<td><div align="right">
<input name="txtMail" type="text" id="txtMail" size="50" maxlength="70">
</div></td>
</tr>
</table>
<p class="Style1">* Champs obligatoires</p>
<p>
<input type="button" name="Verifier" value="Valider" onClick="Valider()">
</p>
</form>
Merci!