Ok, on the update page the code for the galleries list is:
<select name="GalID" id="GalID">
<option value="<?php echo(str_replace('"', '"', $row_WADAphotogallery['GalID'])); ?>" selected="selected"><?php echo(str_replace('"', '"', $row_WADADynListphotogaltitle['GalTitle'])); ?></option>
<?php do { ?>
<option value="<?php echo $row_rsGalleriesList['GalID']; ?>"><?php echo $row_rsGalleriesList['GalTitle']; ?></option>
<?php } while ($row_rsGalleriesList = mysql_fetch_assoc($rsGalleriesList)); ?>
</select>
delete the first option:
<option value="<?php echo(str_replace('"', '"', $row_WADAphotogallery['GalID'])); ?>" selected="selected"><?php echo(str_replace('"', '"', $row_WADADynListphotogaltitle['GalTitle'])); ?></option>
then in design view, select the gallery list, in the property inspector, click the Dynamic button.
Next to the "Select Value Equal To Option, click the lightning bolt and select, expand the WADAphotogallery recordset and select the GalID column.