Mon formulaire Java

Bonjour à tous.
Voilà j'ai créer un petit formulaire pour mon site qui fonctionne impec et tourne grâce au serveur d'un de mes hébergeurs Web belge, à savoir Skynet. Mais malheureusement je n'ai pas sécuriser mon formulaire et j'aimerais qu'au moment de pousser sur le bouton [Envoyer], les champs NOM, PRENOM, E-MAIL & VILLE soit vérifier en tant que remplis sinon il retournerais un message d'erreur pour le demander ! Y'a t-il de moyen de vite faire ça ? Merci à tous !!! je vous laisse mon petit code et je vous remercie tres fort !
Code:
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<FORM METHOD=POST ACTION="http://users.skynet.be/cgi-bin/formd.cgi" onsubmit="return formemail_Validator(this)" name="formemail">
 
<body bgcolor="#181C20">
 
<INPUT TYPE=hidden NAME="to" value ="XXXXXXXXXXXXXX">
<INPUT TYPE=hidden NAME="subject" VALUE="XXXXXXXXXXXXXX">
<INPUT TYPE=hidden NAME="next" value="XXXXXXXXXXXXX">
<table border="1" width="493" height="133" style="border-width: 0px">
	<tr>
		<td height="29" width="483" colspan="5" bgcolor="#181C20" style="border-style: none; border-width: medium">
		<p align="center">
		<font face="Verdana" style="font-weight:700" color="#FFFF00" size="4">Vous</font></td>
	</tr>
	<tr>
		<td height="33" width="72" style="border-style: none; border-width: medium">
		<p align="center">
	              <select name="genre">
	              <option>Mlle</option>
                <option>Mme</option>
                <option>Mr</option>
 
              </select></td>
		<td height="33" width="33" style="border-style: none; border-width: medium"><span style="font-size: 9pt">
		<font color="#FFFFFF" face="Verdana">Nom:</font></span></td>
		<td height="33" width="153" style="border-style: none; border-width: medium">
    <font face="Verdana"><span style="font-size: 9pt">
    <INPUT name="nom" size="15" style="float: left"></span></font></td>
		<td height="33" width="63" style="border-style: none; border-width: medium">
		<font color="#FFFFFF" face="Verdana" style="font-size: 9pt">Prénom:</font></td>
		<td height="33" width="139" style="border-style: none; border-width: medium">
    <font face="Verdana"><span style="font-size: 9pt">
    <INPUT name="prenom" size="15" style="float: left"></span></font></td>
	</tr>
	<tr>
		<td height="29" width="71" style="border-style: none; border-width: medium">
		<p align="right">
		<font face="Verdana" style="font-size: 9pt" color="#FFFFFF">E-Mail:</font></td>
		<td height="29" width="33" style="border-style: none; border-width: medium">&nbsp;</td>
		<td height="29" width="367" colspan="3" style="border-style: none; border-width: medium">
	<font face="Verdana"><span style="font-size: 9pt">
	<INPUT name="e-mail" size="24" style="float: left"></span></font></td>
	</tr>
	<tr>
		<td height="30" width="71" style="border-style: none; border-width: medium">
		<p align="right"><font face="Verdana" color="#FFFFFF"><span style="font-size: 9pt">
		Téléphone:</span></font></td>
		<td height="30" width="33" style="border-style: none; border-width: medium">&nbsp;</td>
		<td height="30" width="367" colspan="3" style="border-style: none; border-width: medium">
	<font face="Verdana"><span style="font-size: 9pt">
	<INPUT name="Telephone" size="24" style="float: left"></span></font></td>
	</tr>
	</table>
 
<table border="1" width="14" height="29" style="border-width: 0px">
	<tr>
		<td height="23" width="14" style="border-style: none; border-width: medium">&nbsp;</td>
	</tr>
</table>
<table border="1" width="493" height="154" style="border-width: 0px">
	<tr>
		<td height="30" width="493" colspan="5" bgcolor="#181C20" style="border-style: none; border-width: medium">
		<p align="center">
		<font face="Verdana" style="font-weight:700" size="4" color="#FFFF00">Votre 
		évènement</font></td>
	</tr>
	<tr>
		<td height="28" width="79" style="border-style: none; border-width: medium">
		<font face="Verdana" style="font-size: 9pt" color="#FFFFFF">
		Organisateur:</font></td>
		<td height="28" width="398" colspan="4" style="border-style: none; border-width: medium">
	              <select name="Organisateur">
                <option>Particulier</option>
                <option>Restaurant/Café</option>
                <option>École</option>
                <option>Association</option>
                <option>Autre</option>
 
              </select></td>
	</tr>
	<tr>
		<td height="27" width="79" style="border-style: none; border-width: medium">
		<font face="Verdana" style="font-size: 9pt" color="#FFFFFF">
		Évènement:</font></td>
		<td height="27" width="129" style="border-style: none; border-width: medium">
	              <select name="Evenement">
                <option>Anniversaire</option>
                <option>Communion</option>
                <option>Baptème</option>
                <option>Mariage</option>
                <option>Soirée rhéto</option>
                <option>Soirée privée</option>
                <option>Autre</option>
 
              </select></td>
		<td height="27" width="43" style="border-style: none; border-width: medium">
	              </td>
		<td height="27" width="103" style="border-style: none; border-width: medium">
	              <font face="Verdana" style="font-size: 9pt" color="#FFFFFF">Nbr personnes:</font></td>
		<td height="27" width="96" style="border-style: none; border-width: medium">
	              <select name="Nbr-Personnes">
                <option>- de 50</option>
                <option>50 à 100</option>
                <option>100 à 150</option>
                <option>150 à 200</option>
                <option>+ de 200</option>
 
              </select></td>
	</tr>
	<tr>
		<td height="27" width="79" style="border-style: none; border-width: medium">
		<font face="Verdana" style="font-size: 9pt" color="#FFFFFF">
		Lieu:</font></td>
		<td height="27" width="398" colspan="4" style="border-style: none; border-width: medium">
	              <select name="Lieu">
                <option>Salle de réception</option>
                <option>Restaurant/Café</option>
                <option>École</option>
                <option>Particulier</option>
                <option>Plein air</option>
                <option>Autre</option>
 
              </select></td>
	</tr>
	<tr>
		<td height="28" width="79" style="border-style: none; border-width: medium">
		<font face="Verdana" style="font-size: 9pt" color="#FFFFFF">
		Ville:</font></td>
		<td height="28" width="129" style="border-style: none; border-width: medium">
	<font face="Verdana"><span style="font-size: 9pt">
	<INPUT name="Ville" size="16" style="float: left"></span></font></td>
		<td height="28" width="43" style="border-style: none; border-width: medium">
	&nbsp;</td>
		<td height="28" width="103" style="border-style: none; border-width: medium">
	<font face="Verdana" style="font-size: 9pt" color="#FFFFFF">Code postal:</font></td>
		<td height="28" width="96" style="border-style: none; border-width: medium">
	<font face="Verdana"><span style="font-size: 9pt">
	<INPUT name="Code-Postal" size="6" style="float: left"></span></font></td>
	</tr>
	</table>
<table border="1" width="492" height="32" style="border-width: 0px">
	<tr>
		<td height="26" width="128" style="border-style: none; border-width: medium">
		<font face="Verdana" style="font-size: 9pt" color="#FFFFFF">
		Date (jj/mm/aaaa):</font></td>
		<td height="26" width="157" style="border-style: none; border-width: medium">
	<font face="Verdana"><span style="font-size: 9pt">
	<INPUT name="Date" size="16" style="float: left"></span></font></td>
		<td height="26" width="59" style="border-style: none; border-width: medium">
	<font face="Verdana" style="font-size: 9pt" color="#FFFFFF">Horaire:</font></td>
		<td height="26" width="40" style="border-style: none; border-width: medium">
	              <select name="Heure-debut">
                <option>0</option>
                <option>1</option>
                <option>2</option>
                <option>3</option>
                <option>4</option>
                <option>5</option>
                <option>6</option>
                <option>7</option>
                <option>8</option>
                <option>9</option>
                <option>10</option>
                <option>11</option>
                <option>12</option>
                <option>13</option>
                <option>14</option>
                <option>15</option>
                <option>16</option>
                <option>17</option>
                <option>18</option>
                <option>19</option>
                <option>20</option>
                <option>21</option>
                <option>22</option>
                <option>23</option>
 
              </select></td>
		<td height="26" width="11" style="border-style: none; border-width: medium">
	              <p align="center"><font face="Verdana" style="font-size: 9pt">
					à</font></td>
		<td height="26" width="57" style="border-style: none; border-width: medium">
	              <select name="Heure-fin">
                <option>0</option>
                <option>1</option>
                <option>2</option>
                <option>3</option>
                <option>4</option>
                <option>5</option>
                <option>6</option>
                <option>7</option>
                <option>8</option>
                <option>9</option>
                <option>10</option>
                <option>11</option>
                <option>12</option>
                <option>13</option>
                <option>14</option>
                <option>15</option>
                <option>16</option>
                <option>17</option>
                <option>18</option>
                <option>19</option>
                <option>20</option>
                <option>21</option>
                <option>22</option>
                <option>23</option>
 
              </select></td>
	</tr>
	</table>
<table border="1" width="493" height="55" style="border-width: 0px">
	<tr>
		<td height="55" width="109" style="border-style: none; border-width: medium">
		<font face="Verdana" color="#FFFFFF">
		<span style="font-size: 9pt">Votre message:</span></font></td>
		<td height="55" width="368" style="border-style: none; border-width: medium"><font face="Verdana"><span style="font-size: 9pt">
		<TEXTAREA name="Message" cols="43" rows="4"></TEXTAREA></span></font></td>
	</tr>
</table>
<table border="1" width="8" height="25" style="border-width: 0px">
	<tr>
		<td height="19" width="8" style="border-style: none; border-width: medium"></td>
	</tr>
</table>
<table border="1" width="494" height="48" style="border-width: 0px">
	<tr>
		<td height="30" width="334" style="border-style: none; border-width: medium">
		<p align="center">
		<font face="Verdana" style="font-size: 9pt" color="#FFFFFF">
		Comment avez-vous découvert Démoniak Sono ?</font></td>
		<td height="30" width="144" style="border-style: none; border-width: medium">
	              <select name="Cmt-connu-site?">
                <option>Ami/Proche</option>
                <option>Annonce Ebay</option>
                <option>Vu en soirée</option>
                <option>Publicité</option>
                <option>Sur Véhicule</option>
                <option>Autre</option>
 
              </select></td>
	</tr>
	<tr>
		<td height="2" width="478" colspan="2" style="border-style: none; border-width: medium">&nbsp;<p align="center">
		<font face="Verdana" style="font-size: 9pt" color="#FFFFFF">Merci de vérifier votre 
		adresse E-Mail et téléphone avant de cliquer <i><br>
		une seule fois</i> sur &quot;Valider&quot;<br>
&nbsp;</font></td>
		</tr>
</table>
<table border="1" width="494" height="48" style="border-width: 0px">
	<tr>
    <td width="229" height="57" align="center" bordercolorlight="#000000" bordercolordark="#000000" style="border-style: none; border-width: medium">
    <p align="center">
 
 
<font face="Verdana"><span style="font-size: 9pt">
 
 
<INPUT type="submit" name="nom2" value="Envoyer" style="float: right"> </span>
</font> </td>
    <td width="249" height="57" align="center" bordercolorlight="#000000" bordercolordark="#000000" style="border-style: none; border-width: medium">
    <p align="center">   
 
 
<font face="Verdana"><span style="font-size: 9pt">   
 
 
<INPUT type="reset" name="nom1" value="Effacer le formulaire" style="float: left"></span></font><p align="center">