MB: Frage zu Java

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Hallo,

habe hier ein Formular Code siehe etwas weiter unten. Wie kann ich das jetzt machen, dass alle Felder überprüft werden, dass die auch ausgefüllt sind und dass es eine gültige Mail Addy ist ?

Gruß Martin

CODE:

<html>
<head>
<title>Anmeldung</title>
<meta name="author" content="NC-solutions">
<meta name="author" content="MB-Webdesign">
<meta name="author" content="Corina Klich = http://www.feenquell.de">
<meta name="generator" content="HTML-Editor">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css">
<!--
body,td,th {
 color: #FFFFFF;
}
body {
 background-color: #ffffff;
}
.Stil2 {
 color: #990000;
 font-size: 18px;
}
-->
</style>
</head>

<body bgcolor="#CCCCCC">
<div align="center"><span class="Stil2">Bei Team-Potsdam.de anmelden</span>
</div>
<center>
  <form name="frmRegister" method="post" action="eintragen.php">
  <table width="297" border="0">
      <tr>
        <td width="143"><div align="right"><font color="#000000">Nick:</font></div></td>
        <td width="144"><div align="left">
            <input name="nick" type="text" id="nick" maxlength="30">
          </div></td>
      </tr>
      <tr>
        <td><div align="right"><font color="#000000">Vorname: </font></div></td>
        <td><div align="left">
            <input name="vorname" type="text" id="vorname2" maxlength="30">
          </div></td>
      </tr>
      <tr>
        <td><div align="right"><font color="#000000">Nachname: </font></div></td>
        <td><div align="left">
            <input name="nachname" type="text" id="nachname2" maxlength="30">
          </div></td>
      </tr>
      <tr>
        <td><div align="right"><font color="#000000">Passwort: </font></div></td>
        <td><div align="left">
            <input name="passwort1" type="password" id="passwort12" maxlength="30">
          </div></td>
      </tr>
      <tr>
        <td><div align="right"><font color="#000000">Passwort wiederholen: </font></div></td>
        <td><div align="left">
            <input name="passwort2" type="password" id="passwort22" maxlength="30">
          </div></td>
      </tr>
      <tr>
        <td><div align="right"><font color="#000000">Email: </font></div></td>
        <td><div align="left">
            <input name="email" type="text" id="email2" maxlength="30">
          </div></td>
      </tr>
      <tr>
        <td><div align="right"><font color="#000000">Geschlecht: </font></div></td>
        <td><div align="left">
            <select name="geschlecht" id="select">
              <option value="M">männlich</option>
              <option value="W">weiblich</option>
            </select>
          </div></td>
      </tr>
      <tr>
        <td><div align="right"><font color="#000000">Geburtsdatum: </font></div></td>
        <td><p align="left">
            <input name="geburt" type="text" id="geburt2" maxlength="30">
          </p></td>
      </tr>
      <tr>
        <td> <div align="right">
            <input type="submit" name="Submit" value="Absenden">
          </div></td>
        <td><div align="left">
            <input type="reset" name="Submit2" value="Verwerfen">
          </div></td>
      </tr>
    </table>
<p><label></label>
</p>
</form>
<p> </p>
</center>
</body>
</html>