How to catch the selected value for second drop down list?

[wonder_gal]

I have 2 drop down lists here. Supposingly, upon the selection of the 2nd drop down list, I should be able to see textbox entry allowing user to update data being displayed at the bottom. But in my case here, i see no response upon the selection of "selType" which is my second drop down list.

but both also don't work. So any suggestion on how can I retrieve the 2nd drop down list' selected value?
Anyone who know how pls kindly let me know. thanks alot...



I've adi solved my bugs. anyway thanks for viewing. :)