How can I collect values from a form and display them in the same window? For example, to multiply your age by 3:

How old are you?
<---- Here must be there a text field where the user inputs a number, say, 19.


Click to calculate.
<---- Here must be there a button. The user clicks on it and the results must appear immediately:


Result: 57 <---- The result of multiplying 19 * 3 must appear here.


I'll appreciate your teaching.

Kirks.

Hi kirks...
try somethign like below PHP_SELF is a variable whcihc stores the current url so when u post u are set back to the same url after posting data.
<form metho="post" action=$_SERVER[PHP_SELF]>...

i hope it solves ur problem