Creating forms dynamically

Hi all, I have been working on a page where I have a form. I currently have the form in an else block with no access to it if I need to redisplay the form incase of errors. To be more specific I want to redisplay the page with the errors displayed. I would like to have the form coded once. It would save on file size. In my form I have a table that holds the text inputs. I do have MySQL code for dropdown menus. If anyone has any ideas on how to create the form when the error messages are displayed without having to code it a second time please let me know. Oh by the way this is how my page is setup now Class validation {