I have a textbox...named "bnBookingStatus"..

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<input id="status" type="text" name="bnBookingStatus" size="35" value="<%=(conformBookingBN.Fields.Item("bnBookingStatus").Value)%>" readonly>

The text box is disable from user input, but i proved a text button to change the value inside it!

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[Approve] 
[Disapprove] 
[Pending]

and i have another textbox, named "reason"..

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<input id="reason" type="text" name="bnReason" size="35">

What i want to do is...
I want to create a javascript alert message if the value in the two textbox is like the LOGIc below when i trying to submit the form:-

bnBookingStatus="DISAPPROVE" && reason=""

If "bnBookingStatus" textbox value is "DISAPPROVE" and "reason" textbox value is empty,""
then alert that user to fill in the "reason" textbox!
alert("You must specify the disapproval reason!");

If the "bnBookingStatus" textbox value is "APPROVED",
then set the value of the textbox "reason" to be "YOUR BOOKING HAS BEEN PROCESSED!"

If it is pending, DO NOTHING!