Check text field for user name and password

Guys,
Please help me. I have this simple problem...
I want to check if the text field for username and password has value with no POSTBACK.
I got to check that it is null there will be a text that will appear on the page 'Null not allowed'... Can you guide me here.

Crosspost: http://forum.java.sun.com/thread.jspa?threadID=5227035&tstart=0
Please don't crosspost, your query has been replied to in the thread linked to above; continue there.

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Check text field for user name and password

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