problem with From and PHP ....

Hello,

I'm trying to put a html together with php
but i'm stuck ....
I have this in my html code:
<?php
$db=mysql_connect ("localhost", "Pieter", "test") or
die ("Verbinding  mislukt");
mysql_select_db("beoordeling",$db);
$dbnaam="beverenhome";
$query1=mysql_query ("SELECT avg(De_Wilde) FROM $dbnaam");
$query2=mysql_query ("SELECT avg(Deschacht) FROM $dbnaam");
$gemDe_Wilde = mysql_result ($query1,0);
$gemDeschacht = mysql_result ($query2,0);
?>
<form name="punten" action="punten.php" method="get">
<input type="hidden" name="redirect"
value="http://www.anderlecht-online.com/thanks.html" />

<td valign="top" width="60%">
<select name="De_Wilde" size="1">
<option value="0" selected>0</option>
<option value="1" selected>1</option>
<option value="2" selected>2</option>
<option value="3" selected>3</option>
<option value="4" selected>4</option>
<option value="5" selected>5</option>
<option value="6" selected>6</option>
<option value="7" selected>7</option>
<option value="8" selected>8</option>
<option value="9" selected>9</option>
<option value="10" selected>10</option>
</select>
De Wilde</td>
<td valign="top" width="40%">
<FONT COLOR=#000000 FACE="times new roman" SIZE="4"><center><?php
printf("%0.1f", $gemDe_Wilde) ?></center></td>
</tr>

....

and now I want to INSERT a line in my database ...

mysql_query ("INSERT INTO $dbnaam (De_Wilde) VALUES ('$De_Wilde')");

but he gives me an error ....
Notice: Undefined variable: De_Wilde in D:\www\test\punten.php

Help :-)