function imgSwap(ImgName, ImgObject) {
    document.images[ImgName].src = eval(ImgObject + ".src")
	}
	
	
	// preload regular images
	var homeoff = new Image(150, 150)
	homeoff.src = "/images_2009/home_off.png"

	var designoff = new Image(150, 150)
	designoff.src = "/images_2009/design_off.png"
	
	var blogoff = new Image(150, 150)
	blogoff.src = "/images_2009/blog_off.png"
	
	var bostonoff = new Image(150, 150)
	bostonoff.src = "/images_2009/boston_off.png"
	
	var favoritesoff = new Image(150, 150)
	favoritesoff.src = "/images_2009/favorites_off.png"
	

	
	// preload rollover images
	var homeon = new Image(150, 150)
	homeon.src = "/images_2009/home_on.png"

	var designon = new Image(150, 150)
	designon.src = "/images_2009/design_on.png"
	
	var blogon = new Image(150, 150)
	blogon.src = "/images_2009/blog_on.png"
	
	var bostonon = new Image(150, 150)
	bostonon.src = "/images_2009/boston_on.png"
	
	var favoriteson = new Image(150, 150)
	favoriteson.src = "/images_2009/favorites_on.png"