if (document.images) {
//main nav
	nav1 = new Image;		nav1a = new Image;
	nav2 = new Image;		nav2a = new Image;
	nav3 = new Image;		nav3a = new Image;
	nav4 = new Image;		nav4a = new Image;
	nav5 = new Image;		nav5a = new Image;

	nav1.src = "gfx/nav1.gif"; nav1a.src = "gfx/nav1a.gif";
	nav2.src = "gfx/nav2.gif"; nav2a.src = "gfx/nav2a.gif";
	nav3.src = "gfx/nav3.gif"; nav3a.src = "gfx/nav3a.gif";
	nav4.src = "gfx/nav4.gif"; nav4a.src = "gfx/nav4a.gif";
	nav5.src = "gfx/nav_home.gif"; nav5a.src = "gfx/nav_homea.gif";

function chgImg(imgField,newImg) {
	if (document.images) {
		document[imgField].src= eval(newImg + ".src")
		}
	}
}