var loaded = false;

if (document.images) {
	var subnav1 = new Image();
	subnav1.src = "/exhibits/charters/images/subnav_charters_1_off.gif";
	var subnav2 = new Image();
	subnav2.src = "/exhibits/charters/images/subnav_charters_2_off.gif";
	var subnav3 = new Image();
	subnav3.src = "/exhibits/charters/images/subnav_charters_3_off.gif";
	var subnav4 = new Image();
	subnav4.src = "/exhibits/charters/images/subnav_charters_4_off.gif";
	var subnav5 = new Image();
	subnav5.src = "/exhibits/charters/images/subnav_charters_5_off.gif";
	var subnav6 = new Image();
	subnav6.src = "/exhibits/charters/images/subnav_charters_6_off.gif";

	var subnav1on = new Image();
	subnav1on.src = "/exhibits/charters/images/subnav_charters_1_on.gif";
	var subnav2on = new Image();
	subnav2on.src = "/exhibits/charters/images/subnav_charters_2_on.gif";
	var subnav3on = new Image();
	subnav3on.src = "/exhibits/charters/images/subnav_charters_3_on.gif";
	var subnav4on = new Image();
	subnav4on.src = "/exhibits/charters/images/subnav_charters_4_on.gif";
	var subnav5on = new Image();
	subnav5on.src = "/exhibits/charters/images/subnav_charters_5_on.gif";
	var subnav6on = new Image();
	subnav6on.src = "/exhibits/charters/images/subnav_charters_6_on.gif";
}

function subNavRollOut(n) {
	if (loaded) {
		eval("document.images.subnavbtn"+n+".src = subnav"+n+".src");
	}
}

function subNavRollOver(n) {
	if (loaded) {
		eval("document.images.subnavbtn"+n+".src = subnav"+n+"on.src");
	}
}