nav1 = new Image(157,165)
nav1.src = "images/Astro1.gif"
nav1over = new Image(157,165)
nav1over.src = "images/Astro2.gif"

nav2 = new Image(156,165)
nav2.src = "images/Cook1.gif"
nav2over = new Image(156,165)
nav2over.src = "images/Cook2.gif"

nav3 = new Image(157,165)
nav3.src = "images/Waka1.gif"
nav3over = new Image(157,165)
nav3over.src = "images/Waka2.gif"

nav4 = new Image(157,165)
nav4.src = "images/Exped1.gif"
nav4over = new Image(157,165)
nav4over.src = "images/Exped2.gif"