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$tabellenname="bonbons";
$sql1="SELECT bildurl FROM $tabellenname WHERE ID='$ID' ";
$link1=mysql_connect("localhost", "user", "pw");
mysql_select_db("db",$link1);
$result1=mysql_query($sql1,$link1);

while($row = mysql_fetch_array($result1)){
$bildurl=$row['bildurl']; 
} 
?>
<?php echo "<form name=change method=post 
action=chadetails.php?ID=$ID enctype=multipart/form-data>";?>
<table>
<tr> 
<td>Vorschaubild f&uuml;r den Artikel:</td>
<td><input type="file" name="bildurl" value="<?php echo $bildurl; ?>"></td>
</tr>
<tr> 
<td>nbsp;</td>
<td> 
<input type="submit" name="Abschicken" value="Abschicken">
<input type="reset" name="L&ouml;schen" value="L&ouml;schen">
</td>
</tr>
</table>
</form>

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if($_POST['bild']){

 $sql = "img='$_POST[bild]";

}

else {

$sql = "";

}

mysql_query("UPDATE table SET foo='$foo', ..., $sql");