Help - Urgently

[skc]

Hi all,
I am a new in PHP.
When I am collecting information from form via. Post method.
it has give the following error :

Notice: Use of undefined constant txtyear - assumed 'txtyear' in D:\Documents and Settings\sunil.kc\Desktop\NptoEn\convert.php on line 9

Notice: Use of undefined constant txtmonth - assumed 'txtmonth' in D:\Documents and Settings\sunil.kc\Desktop\NptoEn\convert.php on line 10

Notice: Use of undefined constant txtday - assumed 'txtday' in D:\Documents and Settings\sunil.kc\Desktop\NptoEn\convert.php on line 11

Notice: Use of undefined constant txtmode - assumed 'txtmode' in D:\Documents and Settings\sunil.kc\Desktop\NptoEn\convert.php on line 12

After this message,
it works fine. How can I remove the above error message from PHP page.

[wilku]

Could you at least post those lines which cause problems?
I'm guessing that you use $POST[txtyear] instead $POST['txtyear'].