I found a way to do this by hand using a do/while routine for a repeating table:
<select name="CatalogItems" size="6" multiple> <?php do { ?>
<option value="<?php echo $row_catlist['ItemCatID']; ?> "><?php echo $row_catlist['ItemName']; ?></option>
<?php } while ($row_catlist = mysql_fetch_assoc($catlist)); ?> </select>