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();
	
	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_enlarge.gif";
	nav_enl32.src = "/wgbh/nova/images02/nav_side_enlarge_on.gif";
	nav_enl41.src = "/wgbh/nova/images02/nav_side_enlarge.gif";
	nav_enl42.src = "/wgbh/nova/images02/nav_side_enlarge_on.gif";
	nav_enl51.src = "/wgbh/nova/images02/nav_side_enlarge.gif";
	nav_enl52.src = "/wgbh/nova/images02/nav_side_enlarge_on.gif";


	nav_enl61.src = "/wgbh/nova/images02/nav_side_enlarge2.gif";
	nav_enl62.src = "/wgbh/nova/images02/nav_side_enlarge2_on.gif";
	nav_enl71.src = "/wgbh/nova/images02/nav_side_enlarge2.gif";
	nav_enl72.src = "/wgbh/nova/images02/nav_side_enlarge2_on.gif";
	nav_enl81.src = "/wgbh/nova/images02/nav_side_enlarge2.gif";
	nav_enl82.src = "/wgbh/nova/images02/nav_side_enlarge2_on.gif";
	nav_enl91.src = "/wgbh/nova/images02/nav_side_enlarge2.gif";
	nav_enl92.src = "/wgbh/nova/images02/nav_side_enlarge2_on.gif";
}