2 more things...(sorry!)

1st can someone make me a ascii 386?(about medium size)

2nt how whold i set somthing up to where if its not a number it whold give a eror message?(in the if thing like so... "if([dont know what goses here])" like that)

3rd how do i clear the screen and move text around? i'm trying to do somthing where if you type somthing that dosent fit then theres a 15% chance it will go...

                                      system error!
                                         you fail.

                              press any key to continue...
in the middle of the screen

sorry for all the simple questions