if (document.images) {

	welcomeon = new Image();
	welcomeon.src = "images/topnav_welcome_on.jpg";

	welcomeoff = new Image();
	welcomeoff.src = "images/topnav_welcome_off.jpg";

	spaceon = new Image();
	spaceon.src = "images/topnav_space_on.jpg";

	spaceoff = new Image();
	spaceoff.src = "images/topnav_space_off.jpg";

	capabilitieson = new Image();
	capabilitieson.src = "images/topnav_capabilities_on.jpg";

	capabilitiesoff = new Image();
	capabilitiesoff.src = "images/topnav_capabilities_off.jpg";

	staffon = new Image();
	staffon.src = "images/topnav_staff_on.jpg";

	staffoff = new Image();
	staffoff.src = "images/topnav_staff_off.jpg";

	mapon = new Image();
	mapon.src = "images/topnav_map_on.jpg";

	mapoff = new Image();
	mapoff.src = "images/topnav_map_off.jpg";

	ftpon = new Image();
	ftpon.src = "images/topnav_ftp_on.jpg";

	ftpoff = new Image();
	ftpoff.src = "images/topnav_ftp_off.jpg";	

}

function changeImages() {
  if (document.images) {
	for (var i=0; i<changeImages.arguments.length; i+=2) {
	  document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
	}
  }
}