if(document.images) {
	
	var nav_btt1 = new Image();
	var nav_btt2 = new Image();
	
	var nav_ctw1 = new Image();
	var nav_ctw2 = new Image();
	
	var nav_ctw21 = new Image();
	var nav_ctw22 = new Image();
	
	var nav_cre1 = new Image();
	var nav_cre2 = new Image();
	
	var nav_fee1 = new Image();
	var nav_fee2 = new Image();
	
	var nav_pri1 = new Image();
	var nav_pri2 = new Image();
	
	var nav_enl1 = new Image();
	var nav_enl2 = new Image();
	
	var nav_bac1 = new Image();
	var nav_bac2 = new Image();
	
	var nav_nex1 = new Image();
	var nav_nex2 = new Image();
	
	var nav_enl21 = new Image();
	var nav_enl22 = new Image();
	
	var nav_enl31 = new Image();
	var nav_enl32 = new Image();
	var nav_enl41 = new Image();
	var nav_enl42 = new Image();
	var nav_enl51 = new Image();
	var nav_enl52 = new Image();

	var nav_enl61 = new Image();
	var nav_enl62 = new Image();
	var nav_enl71 = new Image();
	var nav_enl72 = new Image();
	var nav_enl81 = new Image();
	var nav_enl82 = new Image();
	var nav_enl91 = new Image();
	var nav_enl92 = new Image();
	var nav_enl101 = new Image();
	var nav_enl102 = new Image();
	var nav_enl111 = new Image();
	var nav_enl112 = new Image();
	var nav_enl121 = new Image();
	var nav_enl122 = new Image();
	var nav_enl131 = new Image();
	var nav_enl132 = new Image();
	var nav_enl141 = new Image();
	var nav_enl142 = new Image();
	var nav_enl151 = new Image();
	var nav_enl152 = new Image();
	var nav_enl161 = new Image();
	var nav_enl162 = new Image();
	var nav_enl171 = new Image();
	var nav_enl172 = new Image();
	var nav_enl181 = new Image();
	var nav_enl182 = new Image();
	var nav_enl191 = new Image();
	var nav_enl192 = new Image();
	var nav_enl201 = new Image();
	var nav_enl202 = new Image();
	var nav_enl211 = new Image();
	var nav_enl212 = new Image();
	var nav_enl221 = new Image();
	var nav_enl222 = new Image();
	
	var nav_btt021 = new Image();
	var nav_btt022 = new Image();
	var nav_btt031 = new Image();
	var nav_btt032 = new Image();
	var nav_btt041 = new Image();
	var nav_btt042 = new Image();
	var nav_btt051 = new Image();
	var nav_btt052 = new Image();
	var nav_btt061 = new Image();
	var nav_btt062 = new Image();
	var nav_btt071 = new Image();
	var nav_btt072 = new Image();
	var nav_btt081 = new Image();
	var nav_btt082 = new Image();
	var nav_btt091 = new Image();
	var nav_btt092 = new Image();
	var nav_btt101 = new Image();
	var nav_btt102 = new Image();
	var nav_btt111 = new Image();
	var nav_btt112 = new Image();
	var nav_btt121 = new Image();
	var nav_btt122 = new Image();
	var nav_btt131 = new Image();
	var nav_btt132 = new Image();
	var nav_btt141 = new Image();
	var nav_btt142 = new Image();

	nav_btt1.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt2.src = "/wgbh/nova/images02/nav_backtotop_on.gif";
	
	nav_ctw1.src = "/wgbh/nova/images02/nav_closethiswindow.gif";
	nav_ctw2.src = "/wgbh/nova/images02/nav_closethiswindow_on.gif";
	
	nav_ctw21.src = "/wgbh/nova/images02/nav_closethiswindow2.gif";
	nav_ctw22.src = "/wgbh/nova/images02/nav_closethiswindow2_on.gif";
	
	nav_cre1.src = "/wgbh/nova/images02/nav_icon_credits.gif";
	nav_cre2.src = "/wgbh/nova/images02/nav_icon_credits_on.gif";
	
	nav_fee1.src = "/wgbh/nova/images02/nav_icon_feedback.gif";
	nav_fee2.src = "/wgbh/nova/images02/nav_icon_feedback_on.gif";
	
	nav_pri1.src = "/wgbh/nova/images02/nav_icon_print.gif";
	nav_pri2.src = "/wgbh/nova/images02/nav_icon_print_on.gif";
	
	nav_enl1.src = "/wgbh/nova/images02/nav_side_enlarge.gif";
	nav_enl2.src = "/wgbh/nova/images02/nav_side_enlarge_on.gif";
	
	nav_bac1.src = "/wgbh/nova/images02/nav_icon_back.gif";
	nav_bac2.src = "/wgbh/nova/images02/nav_icon_back_on.gif";
	
	nav_nex1.src = "/wgbh/nova/images02/nav_icon_next.gif";
	nav_nex2.src = "/wgbh/nova/images02/nav_icon_next_on.gif";
	
	nav_enl21.src = "/wgbh/nova/images02/nav_side_enlarge2.gif";
	nav_enl22.src = "/wgbh/nova/images02/nav_side_enlarge2_on.gif";
	

	nav_enl31.src = "/wgbh/nova/images02/nav_side_enlarge3.gif";
	nav_enl32.src = "/wgbh/nova/images02/nav_side_enlarge3_on.gif";
	nav_enl41.src = "/wgbh/nova/images02/nav_side_enlarge3.gif";
	nav_enl42.src = "/wgbh/nova/images02/nav_side_enlarge3_on.gif";
	nav_enl51.src = "/wgbh/nova/images02/nav_side_enlarge3.gif";
	nav_enl52.src = "/wgbh/nova/images02/nav_side_enlarge3_on.gif";
	nav_enl61.src = "/wgbh/nova/images02/nav_side_enlarge3.gif";
	nav_enl62.src = "/wgbh/nova/images02/nav_side_enlarge3_on.gif";
	nav_enl71.src = "/wgbh/nova/images02/nav_side_enlarge3.gif";
	nav_enl72.src = "/wgbh/nova/images02/nav_side_enlarge3_on.gif";
	nav_enl81.src = "/wgbh/nova/images02/nav_side_enlarge3.gif";
	nav_enl82.src = "/wgbh/nova/images02/nav_side_enlarge3_on.gif";
	nav_enl91.src = "/wgbh/nova/images02/nav_side_enlarge3.gif";
	nav_enl92.src = "/wgbh/nova/images02/nav_side_enlarge3_on.gif";
	nav_enl101.src = "/wgbh/nova/images02/nav_side_enlarge3.gif";
	nav_enl102.src = "/wgbh/nova/images02/nav_side_enlarge3_on.gif";
	nav_enl111.src = "/wgbh/nova/images02/nav_side_enlarge3.gif";
	nav_enl112.src = "/wgbh/nova/images02/nav_side_enlarge3_on.gif";
	nav_enl121.src = "/wgbh/nova/images02/nav_side_enlarge3.gif";
	nav_enl122.src = "/wgbh/nova/images02/nav_side_enlarge3_on.gif";
	nav_enl131.src = "/wgbh/nova/images02/nav_side_enlarge3.gif";
	nav_enl132.src = "/wgbh/nova/images02/nav_side_enlarge3_on.gif";
	
	nav_enl141.src = "/wgbh/nova/images02/nav_side_enlarge.gif";
	nav_enl142.src = "/wgbh/nova/images02/nav_side_enlarge_on.gif";
	nav_enl151.src = "/wgbh/nova/images02/nav_side_enlarge.gif";
	nav_enl152.src = "/wgbh/nova/images02/nav_side_enlarge_on.gif";
	nav_enl161.src = "/wgbh/nova/images02/nav_side_enlarge.gif";
	nav_enl162.src = "/wgbh/nova/images02/nav_side_enlarge_on.gif";
	nav_enl171.src = "/wgbh/nova/images02/nav_side_enlarge.gif";
	nav_enl172.src = "/wgbh/nova/images02/nav_side_enlarge_on.gif";
	nav_enl181.src = "/wgbh/nova/images02/nav_side_enlarge.gif";
	nav_enl182.src = "/wgbh/nova/images02/nav_side_enlarge_on.gif";
	nav_enl191.src = "/wgbh/nova/images02/nav_side_enlarge.gif";
	nav_enl192.src = "/wgbh/nova/images02/nav_side_enlarge_on.gif";
	nav_enl201.src = "/wgbh/nova/images02/nav_side_enlarge.gif";
	nav_enl202.src = "/wgbh/nova/images02/nav_side_enlarge_on.gif";
	nav_enl211.src = "/wgbh/nova/images02/nav_side_enlarge.gif";
	nav_enl212.src = "/wgbh/nova/images02/nav_side_enlarge_on.gif";
	nav_enl221.src = "/wgbh/nova/images02/nav_side_enlarge.gif";
	nav_enl222.src = "/wgbh/nova/images02/nav_side_enlarge_on.gif";


	nav_btt021.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt022.src = "/wgbh/nova/images02/nav_backtotop_on.gif";
	nav_btt031.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt032.src = "/wgbh/nova/images02/nav_backtotop_on.gif";
	nav_btt041.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt042.src = "/wgbh/nova/images02/nav_backtotop_on.gif";	
	nav_btt051.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt052.src = "/wgbh/nova/images02/nav_backtotop_on.gif";	
	nav_btt061.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt062.src = "/wgbh/nova/images02/nav_backtotop_on.gif";	
	nav_btt071.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt072.src = "/wgbh/nova/images02/nav_backtotop_on.gif";	
	nav_btt081.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt082.src = "/wgbh/nova/images02/nav_backtotop_on.gif";	
	nav_btt091.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt092.src = "/wgbh/nova/images02/nav_backtotop_on.gif";	
	nav_btt101.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt102.src = "/wgbh/nova/images02/nav_backtotop_on.gif";	
	nav_btt111.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt112.src = "/wgbh/nova/images02/nav_backtotop_on.gif";	
	nav_btt121.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt122.src = "/wgbh/nova/images02/nav_backtotop_on.gif";	
	nav_btt131.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt132.src = "/wgbh/nova/images02/nav_backtotop_on.gif";	
	nav_btt141.src = "/wgbh/nova/images02/nav_backtotop.gif";
	nav_btt142.src = "/wgbh/nova/images02/nav_backtotop_on.gif";	
	
	var b011 = new Image();
	var b012 = new Image();
	var b021 = new Image();
	var b022 = new Image();
	var b031 = new Image();
	var b032 = new Image();
	var b041 = new Image();
	var b042 = new Image();
	var b051 = new Image();
	var b052 = new Image();
	var b061 = new Image();
	var b062 = new Image();
	var b071 = new Image();
	var b072 = new Image();
	var b081 = new Image();
	var b082 = new Image();
	var b091 = new Image();
	var b092 = new Image();
	var b101 = new Image();
	var b102 = new Image();
	var b111 = new Image();
	var b112 = new Image();


	var d31 = new Image();
	var d32 = new Image();
	var tr_on = new Image();
	var tr_off = new Image();
	var tr_down = new Image();
	var fa_on = new Image();
	var fa_off = new Image();
	var fa_down = new Image();
	
	b011.src = "/wgbh/nova/fish/images/quiz-box.gif";
	b012.src = "/wgbh/nova/fish/images/quiz-box-on.gif";
	b021.src = "/wgbh/nova/fish/images/quiz-box.gif";
	b022.src = "/wgbh/nova/fish/images/quiz-box-on.gif";
	b031.src = "/wgbh/nova/fish/images/quiz-box.gif";
	b032.src = "/wgbh/nova/fish/images/quiz-box-on.gif";
	b041.src = "/wgbh/nova/fish/images/quiz-box.gif";
	b042.src = "/wgbh/nova/fish/images/quiz-box-on.gif";
	b051.src = "/wgbh/nova/fish/images/quiz-box.gif";
	b052.src = "/wgbh/nova/fish/images/quiz-box-on.gif";
	b061.src = "/wgbh/nova/fish/images/quiz-box.gif";
	b062.src = "/wgbh/nova/fish/images/quiz-box-on.gif";
	b071.src = "/wgbh/nova/fish/images/quiz-box.gif";
	b072.src = "/wgbh/nova/fish/images/quiz-box-on.gif";
	b081.src = "/wgbh/nova/fish/images/quiz-box.gif";
	b082.src = "/wgbh/nova/fish/images/quiz-box-on.gif";
	b091.src = "/wgbh/nova/fish/images/quiz-box.gif";
	b092.src = "/wgbh/nova/fish/images/quiz-box-on.gif";
	b101.src = "/wgbh/nova/fish/images/quiz-box.gif";
	b102.src = "/wgbh/nova/fish/images/quiz-box-on.gif";
	b111.src = "/wgbh/nova/fish/images/quiz-box.gif";
	b112.src = "/wgbh/nova/fish/images/quiz-box-on.gif";

	
	d31.src = "/wgbh/nova/fish/images/quiz-next.gif";
	d32.src = "/wgbh/nova/fish/images/quiz-next-on.gif";
	tr_on.src = "/wgbh/nova/fish/images/quiz-true-on.gif";
	tr_off.src = "/wgbh/nova/fish/images/quiz-true.gif";
	tr_down.src = "/wgbh/nova/fish/images/quiz-true-down.gif";
	fa_on.src = "/wgbh/nova/fish/images/quiz-false-on.gif";
	fa_off.src = "/wgbh/nova/fish/images/quiz-false.gif";
	fa_down.src = "/wgbh/nova/fish/images/quiz-false-down.gif";

	var selstate = "0";			// 0 - unselected, 1 - true, 2 - false

function showIt(obj) {
	if      (document.getElementById) { document.getElementById(obj).style.visibility = 'visible'; }
	else if (document.all)            { document.all[obj].style.visibility = 'visible'; }
	else if (document.layers)         { document[obj].visibility = 'visible'; }
	status = '';
	return false;
}

function true_click() {
	if(document.images) {
		document['butt-tru'].src = eval('tr_down.src');
		document['butt-fal'].src = eval('fa_off.src');
		selstate = "1";
		showIt('d1');
		showIt('d2');
		showIt('d3');
	}
}

function false_click() {
	if(document.images) {
		document['butt-tru'].src = eval('tr_off.src');
		document['butt-fal'].src = eval('fa_down.src');
		selstate = "2";
		showIt('d1');
		showIt('d2');
		showIt('d3');
	}
}

function true_off() {
	if((document.images) && (selstate != "1"))
	document['butt-tru'].src = eval('tr_off.src');
}

function true_on() {
	if((document.images) && (selstate != "1"))
	document['butt-tru'].src = eval('tr_on.src');
}

function false_off() {
	if((document.images) && (selstate != "2"))
	document['butt-fal'].src = eval('fa_off.src');
}

function false_on() {
	if((document.images) && (selstate != "2"))
	document['butt-fal'].src = eval('fa_on.src');
}


}