Basically, I have an email/upload form using html and linked to a php script (post.)
I want to have a checkbox or yes/no radio buttons that ask if the submitter is uploading a file. If yes is selected, i want the upload section to be active. If no is selected, I want it to be hidden or “grayed” out.
How can I do this?

I want to add more fields in the html form I filled in when I checked the check box. How to do it ? Can you some give me some quick help ? Thanks