I set up an image gallery for a website I did for my daughters preschool. It is getting a lot of spam registrations. I want to know if someone can tell me the tool that is doing it or it may be custom. every registration is 4 random letters followed by 3 random numbers like "rstu652" I need to change what it searches for to find it. This is run by the teacher of the class, and I would like to make it a bit easier on her if I can.