Need a little insight. Diagram Inside

[jmeeksphoto]

Im setting up air suspension in a car and I am currently laying out all the wiring diagrams. I am stumped on one issue. I would like to have an all up/all down option on my setup, but cant figure out how to get it to behave appropriately. I cant figure out where to place the relay or diode, which is what I believe to be what I should use.

Basically, I can't figure out how to get the all up option without having the individual corner switches affect each solenoid the same way. I need to know if there is a simple isolation option for me. Any help?

[url=http://www.flickr.com/photos/thatmk2kid/8450925721/][img]http://farm9.staticflickr.com/8516/8450925721_1b427a4e7f_z.jpg[/img][/url]
[url=http://www.flickr.com/photos/thatmk2kid/8450925721/]air-solenoid-w_switches[/url] by [url=http://www.flickr.com/people/thatmk2kid/]J_meeks[/url], on Flickr