Fix navigation and add images

I need the next and back buttons updated so that you can visually see if you can't continue and are not able to continue if you shouldn't be able to continue. Also there are several pages that have had the images changed and new images added. ~~~ 1) Fix the Next and Back button functions *On every page the Next button needs to be green if all fields are complete and validation is passed and grey as well as disabled if any fields are not filled in (or a required selection is not made) or a field does not pass validation. *Any event that changes if the user can move on to the next page or not must update the color and state of the next button. 2) Add new images to project *On every “Design and build your Table Apron” page the images under “Define yoru Apron Profile” will need to be updated to match the images provided in updated skirt [login to view URL] *You will need to extract the images for the page from the provided psd files. Note that there are additional options being added as well as the images being changed on the existing options. *Also note that the image needs to reflect the revised image when an option is selected. The database will be provided when a bid is accepted. Please ask if you have any questions Thank you