http://pastebin.com/853709

How can I make the program not give an error message if the user leaves the textboxes empty or puts a letter in them instead of a number.

I'm having trouble with stuff like "Error! Can't change TextBox1 to Integer" or something...

I've tried numerous tricks and asked at IRC, but no use... I'm trying to make it "do nothing" if there is something else than numbers in the textboxes.