Change Color of Image? I need a Mentor!

Hello to all,

I am really needing some help.

I am trying to build a script that will allow a user who visits a website to change the color of a house.

For an example, when a user visits the site they are able to view a picture of a house with a default color of white. When the click on a button "Roof" the user is able to pick from a select number of roof color options.

Same goes for siding, and trim.

This is for a painting site for a family member that I am trying to help. I am hoping with a web presense in this economy, maybe it will turn things around.

What I have seen,

I have seen some sites use shape overlays.

So they take an image, and (I am not sure if it is in Flash or Photoshop) they make a cut out of the roof, then they make 10 copies of it in different colors. For some places I have seen them descibe it at frames for each color. Yet I am not sure how you call upon it on click?

Anyways I am very lost and need a mentor.

Here is an example of what I am trying to do, but with a house:

www.mortonbuildings.com/Two-Stall.aspx

Thanks for anyones help. If you have a donation site let me know as I am appreciative of any and all help. I have even been looking for a coder to help walk me through this, but no luck finding an expert in this.

Thanks

Chris