form validation

hi guys
i am making a contact form. There is text field to insert contact number.

Now here i am looking for the validation of text field. That user can only enter numbers only no words.

how do i do this, That user is allowed to enter number only at "contact number" text field.

thanks

Whoops, didn't realize this was in a flash forum.

not working or may be i am not understanding the php codes.

problem is solved. Just embed the fonts Numericals [0....9] .

that's fine but i am looking solution via scripts also.

thanks

problem solved

textName.restrict = "0-9";