Probleme formulaire html et envoie par email

Bonjour,

svp

je souhaite faire un ( formulaire html ) de saisi tout simple mais je n'arrive pas à le faire envoyer.

Voici mon texte:



<form name="devis" id="devis" method="post" action="mailto:mongmail@gmail.com">

</form>

<table width="100%" border="0" cellspacing="0" cellpadding="0" class="form_tab">
<tr>
<td width="170"><h2>Coordonnées</h2></td>
<td> </td>
</tr>
<tr>
<td>Vous êtes*</td>
<td><select name="structure" id="structure" onchange="showRaison(this.options.selectedIndex);">
<option value="0">Choisissez</option>
<option value="1">Société</option>
<option value="2">Association</option>
<option value="3">Profession libérale</option>
<option value="4">Particulier</option>
<option value="5">Etudiant</option>
<option value="6">Autre</option>
</select></td>
</tr>
<tr id="tr_raison" style="display:none">
<td id="td_raison"></td>
<td><input type="text" name="raison" id="raison" class="input" maxlength="50" size="40" value="" /></td>
</tr>
<tr>
<td>Civilité*</td>
<td><input type="radio" name="civilite" id="civilite_1" value="1" /><label for="civilite_1">Mlle</label> <input type="radio" name="civilite" id="civilite_2" value="2" /><label for="civilite_2">Mme</label> <input type="radio" name="civilite" id="civilite_3" value="3" /><label for="civilite_3">M.</label> </td>
</tr>
<tr>
<td>Nom*</td>
<td><input type="text" name="nom" id="nom" class="input" maxlength="50" size="40" value="" /></td>
</tr>
<tr>
<td>Prénom</td>
<td><input type="text" name="prenom" id="prenom" class="input" maxlength="50" size="40" value="" /></td>
</tr>
<tr>
<td>Téléphone*</td>
<td><input type="text" name="tel" id="tel" class="input" maxlength="20" size="20" onkeypress="return checkNum(event);" value="" /></td>
</tr>
<tr>
<td>Email</td>
<td><input type="text" name="email" id="email" class="input" maxlength="100" size="40" value="" /></td>
</tr>
<tr>
<td><h2>Votre demande</h2></td>
<td> </td>
</tr>
<tr>
<td>Message*</td>
<td><textarea name="ch_1" id="ch_1" class="input" cols="50" rows="8"></textarea></td>
</tr>

<tr>
<td style="font-size:9px;">* champs obligatoires</td>
<td><input type="submit" name="submit" id="submit" value="Valider" /></td>
</tr>
</table>
</form>