var timeout_navId;
var timeout_featureId;

function preload_black_nav() {
if(document.images) {
  var ImgArray = new Array();
  for (var i = 0; i < 6; i++) {
    ImgArray[i] = new Image();
  }    
	ImgArray[0].src = "/wgbh/gormenghast/images/nav_black_novels.gif";
	ImgArray[1].src = "/wgbh/gormenghast/images/nav_black_scenes.gif";
	ImgArray[2].src = "/wgbh/gormenghast/images/nav_black_film.gif";
	ImgArray[3].src = "/wgbh/gormenghast/images/nav_black_home.gif";
	ImgArray[4].src = "/wgbh/gormenghast/images/nav_black_sitemap.gif";
	ImgArray[5].src = "/wgbh/gormenghast/images/nav_black_off.gif";
  }
}


function preload_grey_nav() {
if(document.images) {
  var ImgArray = new Array();
  for (var i = 0; i < 6; i++) {
    ImgArray[i] = new Image();
  }    
	ImgArray[0].src = "/wgbh/gormenghast/images/nav_grey_novels.gif";
	ImgArray[1].src = "/wgbh/gormenghast/images/nav_grey_scenes.gif";
	ImgArray[2].src = "/wgbh/gormenghast/images/nav_grey_film.gif";
	ImgArray[3].src = "/wgbh/gormenghast/images/nav_grey_home.gif";
	ImgArray[4].src = "/wgbh/gormenghast/images/nav_grey_sitemap.gif";
	ImgArray[5].src = "/wgbh/gormenghast/images/nav_grey_off.gif";
  }
}


function nav_on(section, color){
	clearTimeout(timeout_navId);
	if(document.images){
		var nav = eval('document.nav');
		nav.src = '/wgbh/gormenghast/images/nav_' + color + '_' + section + '.gif';
	}
}


function nav_off(section, color){
	if(document.images){
		var nav = '/wgbh/gormenghast/images/nav_' + color + '_' + section + '.gif';
		timeout_navId = setTimeout("reset_Nav(\"" + nav + "\")",10);
	}
}


function reset_Nav(imgRurl) {
	if(document.images) {
   		document.nav.src=imgRurl;
	}
}


function feature_on(feature){
	clearTimeout(timeout_featureId);
	if(document.images){
		var intnav = eval('document.intnav');
		intnav.src = 'images/nav_' + feature + '.gif';
	}
}


function feature_off(feature){
	if(document.images){
		var intnav = 'images/nav_' + feature + '.gif';
		timeout_featureId = setTimeout("reset_Feature(\"" + intnav + "\")",10);
	}
}


function reset_Feature(imgRurl) {
	if(document.images) {
   		document.intnav.src=imgRurl;
	}
}


function pop_top(type){
	var map = "../sitemap.html";
	var copy = "../copyright.html";
	if (type == 'sitemap'){
		var sub_win = window.open(map,'sub_win','toolbar=0,location=0,status=0,menubar=0,scrollbars=1,resizable=1,width=437,height=437');
		sub_win.focus();
	} else if (type == 'copyright'){
		var sub_win = window.open(copy,'sub_win','toolbar=0,location=0,status=0,menubar=0,scrollbars=1,resizable=1,width=437,height=437');
		sub_win.focus();
	}	
	return false;
}

function setname(){
	window.name = 'main';
}