communicationson = new Image()
communicationson.src = "../images/navaux4_communications_over.gif"
communicationsoff = new Image()
communicationsoff.src = "../images/navaux4_communications.gif"

strategicon = new Image()
strategicon.src = "../images/navaux4_strategic_over.gif"
strategicoff = new Image()
strategicoff.src = "../images/navaux4_strategic.gif"

interactiveon = new Image()
interactiveon.src = "../images/navaux4_interactive_over.gif"
interactiveoff = new Image()
interactiveoff.src = "../images/navaux4_interactive.gif"