Display details by category

[system]

Hi there, I have a basic classified ads. So far users have to specify things in a description fields. Like if they are selling a car then they have to mention mileage, color, make. And if they are renting a house they mention bedrooms, bathrooms, price a month…

I am trying to make more convenient or fancy sort of by adding more options(fields) to each category.

For ex: If they are selling a car the form will be something like this:

Name:
Make:
Year:
Used:
Color:
Transmission:
…

If it’s a house:
Name:
Bedrooms:
Surface:
Monthly Price:
…

My database table looks like this:
id, title, description, price, make, mileage, surface, bedrooms, name, number, state, city.

If I can only get some ideas to start with. I am completely stuck right now.
Thanks again

[richei]

The simplest way i can think of would be to have it in 2 parts. Part 1, the basics - contact info (or if that’s all in the account, query for it and have them check to see if its right). Part 2 - the extras. have them first choose the category from a pulldown box, then use ajax to pull the fields from an array or a database table