if (document.images) {
//home 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;
	
	nav1.src = "gfx/nav_seating_map.gif"; nav1a.src = "gfx/nav_seating_map_on.gif";
	nav2.src = "gfx/nav_parking_map.gif"; nav2a.src = "gfx/nav_parking_map_on.gif";
	nav3.src = "gfx/nav_field_news.gif"; nav3a.src = "gfx/nav_field_news_on.gif";
	nav4.src = "gfx/nav_book_event.gif"; nav4a.src = "gfx/nav_book_event_on.gif";
		
function chgImg(imgField,newImg) {
	if (document.images) {
		document[imgField].src= eval(newImg + ".src")
		}
	}
}