disactivate button submit if valueA<valueB

hello experts

i'm doing a small JSP-MYSQL project.

i have a payment page that displays a 'balAcc' and a 'total' field.

the 'balAcc' is from table reg while 'total' is from table svc.

i need to disactivate the submit button if the value of 'balAcc' is less than value of 'total'.

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if  the value of 'balAcc' is greater than 'total', the submit button is enabled and i need to display the total in a redirected page, together with date and time upon the user click on button submit.

the date and time is equals to the date and time the user clicked on the submit button.


please..please..please.. help. thanks in advance.