Making a button unclickable

On my form, I have 2 textboxes where the user enters a first name and a surname, then clicks a button to find matching records.

My question is - I dont want the button to be clickable until both text boxes have been filled. How do I do this?
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Pratima PharandeConnect With a Mentor Commented:
You need to  use the required filed validators or javascript in order to flash the message the both fileds are required. I think this is good approch for this .
bdb12Author Commented:
yeah I figured I'd have to use js....

The field validators is a great idea.

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