You need to read back the selection from the database and place it in a variable. Assuming you can do this we now have a variable say:
ColorVAR = "GREEN"
Now assuming you are not creating your drop down list from a database table, all you need to do is dynamically place the word "selected" in the correct option:
<select name="select">
<option value="RED">RED</option>
<option value="GREEN"
selected>GREEN</option>
<option value="BLUE">BLUE</option>
...
</select>
To do this dynamically we use our variable...
<select name="select">
<option value="RED" <% If ColorVAR='RED' then response.write("selected"

%>>RED</option>
<option value="GREEN" <% If ColorVAR='GREEN' then response.write("selected"

%>>GREEN</option>
<option value="BLUE" <% If ColorVAR='BLUE' then response.write("selected"

%>>BLUE</option>
...
</select>
Do you need help getting the variable set up from the database?
Hope this helps, BDC.