add this code where you want the dropdowns to appear.
a simple example of the day:
<SELECT NAME="day">
<OPTION VALUE="" SELECTED>Day</OPTION>
<OPTION VALUE="1">1</OPTION>
<OPTION VALUE="2">2</OPTION>
<OPTION VALUE="3">3</OPTION>
etcetera
<OPTION VALUE="31">31</OPTION>
</SELECT>
basically, it is the same for the month and the year...

Crash's Site | Crash is from 