creating a lightbox popup form in body - is this possible?

Hi,
I would like to create something like a "popup form" that allows user to enter text in different text fields and then once it's done it will print the output(with those user input data) as raw the html code into the field of "body".

The reason I want to do this is because I want facilitate user to enter the data with the proper format/aligns.

for example,
in this popup form, i will have title, dates, event description, links to images and etc.
after the user enters all these, an html code will be generated with all the proper aligns and formats.
so that user doesn't need to mess with html editors which often have hard time getting the correct format.

I was wondering if someone could point me to the right direction.

thanks