[solved] Is it possible to decrypt sha1 password?

[eluser]tuckee[/eluser]
I would like to decrypt sha1 password if user forgot their password. is it possible to do so?

Code:

$sha1_password = sha1($password);

this is how i encrypt. but have no clue on how to decrypt. i browse through the forum and some suggest saying is not possible, but u could send them a random password and changed it.

so in my curiosity, is it possible to decrypt so that user is able to use back the same password the user registered?