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Thanks for the reply. But to be frank, it doesn't work on my program. =/ Any better idea?

Yeah, I have tried many ways on make the two drop down box work, in fact, I can only get those two working but not the textbox.
Meaning when both selected, whether or not I enter values in textbox,...

Okay, I need to create a webpage for querying data. Page will have a table for user to select their choice, let's say 2 drop down box then 1 optional textbox.
Name 2 drop down box as A and B, and...

2 drop down box and 1 text field connected.
The text field should be an optional; meaning, if first 2 drop down is selected, my page will still proceed even text field is empty.