<select name=*insert*_<%field%>_function><option>
<option>ASCII
<option>CHAR
<option>SOUNDEX
<option>CURDATE
<option>CURTIME
<option>FROM_DAYS
<option>FROM_UNIXTIME
<option>NOW
<option>PASSWORD
<option>PERIOD_ADD
<option>PERIOD_DIFF
<option>TO_DAYS
<option>USER
<option>WEEKDAY
<option>RAND
</select>