homeOff = new Image();
homeOn = new Image();
homeOff.src = "../images/topnav_tab_home_OFF.gif";
homeOn.src = "../images/topnav_tab_home_ON.gif";

emailOff = new Image();
emailOn = new Image();
emailOff.src = "../images/topnav_tab_email_OFF.gif";
emailOn.src = "../images/topnav_tab_email_ON.gif";

lynxOff = new Image();
lynxOn = new Image();
lynxOff.src = "../images/topnav_tab_lynx_OFF.gif";
lynxOn.src = "../images/topnav_tab_lynx_ON.gif";

bookmarkOff = new Image();
bookmarkOn = new Image();
bookmarkOff.src = "../images/topnav_tab_bookmark_OFF.gif";
bookmarkOn.src = "../images/topnav_tab_bookmark_ON.gif";