if (document.images) {
	tnav1_on = new Image;
	tnav1_off = new Image;
	tnav2_on = new Image;
	tnav2_off = new Image;
	tnav3_on = new Image;
	tnav3_off = new Image;
	tnav4_on = new Image;
	tnav4_off = new Image;
	tnav5_on = new Image;
	tnav5_off = new Image;

	tnav1_on.src = "images/tnav_011.gif";
	tnav1_off.src = "images/tnav_010.gif";
	tnav2_on.src = "images/tnav_021.gif";
	tnav2_off.src = "images/tnav_020.gif";
	tnav3_on.src = "images/tnav_031.gif";
	tnav3_off.src = "images/tnav_030.gif";
	tnav4_on.src = "images/tnav_041.gif";
	tnav4_off.src = "images/tnav_040.gif";
	tnav5_on.src = "images/tnav_051.gif";
	tnav5_off.src = "images/tnav_050.gif";
	}
else {
	tnav1_on = "";
	tnav1_off = "";
	tnav2_on = "";
	tnav2_off = "";
	tnav3_on = "";
	tnav3_off = "";
	tnav4_on = "";
	tnav4_off = "";
	tnav5_on = "";
	tnav5_off = "";

	document.tnav1 = "";
	document.tnav2 = "";
	document.tnav3 = "";
	document.tnav4 = "";
	document.tnav5 = "";
}