if (document.images) {
	buttonag = new Image;
	buttonan = new Image;
	buttonbg = new Image;
	buttonbn = new Image;
	buttoncg = new Image;
	buttoncn = new Image;
	buttondg = new Image;
	buttondn = new Image;

	buttonag.src = "images/nav011.gif";
	buttonan.src = "images/nav010.gif";
	buttonbg.src = "images/nav021.gif";
	buttonbn.src = "images/nav020.gif";
	buttoncg.src = "images/nav031.gif";
	buttoncn.src = "images/nav030.gif";
	buttondg.src = "images/nav041.gif";
	buttondn.src = "images/nav040.gif";
	}
else {
	buttonag = "";
	buttonan = "";
	buttonbg = "";
	buttonbn = "";
	buttoncg = "";
	buttoncn = "";
	buttondg = "";
	buttondn = "";

	document.buttona = "";
	document.buttonb = "";
	document.buttonc = "";
	document.buttond = "";
}