Blümchen: Felder formatieren

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Hallo euch allen,

hab mal eine Frage. Und zwar ich habe folgenden Code:

<table width="95%"  border="0" align="center">
                                      <tr>
                                        <td height="124"><form name="form1" method="post" action="posting.php">
                                            <table width="100%"  border="0">
                                              <tr bgcolor="#efefef">
                                                <td width="22%" height="28"><p>Name:</p></td>
                                                <td width="78%"><input name="name" type="text" id="name" size="40"></td>
                                              </tr>
                                              <tr bgcolor="#efefef">
                                                <td height="27"><p>WebSeite:</p></td>
                                                <td><input name="url" type="text" id="url" size="40"></td>
                                              </tr>
                                              <tr bgcolor="#efefef">
                                                <td height="29"><p>eMail:</p></td>
                                                <td><input name="email" type="text" id="email" size="40"></td>
                                              </tr>
                                              <tr bgcolor="#efefef">
                                                <td height="26"><p>Betreff:</p></td>
                                                <td><input name="betreff" type="text" id="betreff" size="40"></td>
                                              </tr>
                                              <tr bgcolor="#efefef">
                                                <td height="38"><p>Nachricht:</p></td>
                                                <td><textarea name="text" cols="40" rows="4" id="text"></textarea></td>
                                              </tr>
                                              <tr bgcolor="#efefef">
                                                <td height="38">&nbsp;</td>
                                                <td><input type="submit" name="Submit" value="&gt;&gt; eintragen"></td>
                                              </tr>
                                            </table>
                                        </form></td>
                                      </tr>
                                    </table>

So hier möchte ich nun das so machen, wenn man auf abschicken klickt und eben nicht alle Felder ausgefüllt sind, dass dann keine Meldung kommt oder so sondern einfach nur die Farbe ändert. Also z.B. dass das dann Rot wird.

Kann mir da jemand helfen, dass ich das hin bekomme?

Gruß Blümchen