// preload navigation images

function preload(){
	if(document.images) {
	  var ImgArray = new Array();
	  for (var i = 0; i < 12; i++) {
	    ImgArray[i] = new Image();
	  }
	ImgArray[0].src = "images/map_met_on.gif";
	ImgArray[1].src = "images/map_met_name_on.gif";
	ImgArray[2].src = "images/map_mfa_on.gif";
	ImgArray[3].src = "images/map_mfa_name_on.gif";
	ImgArray[4].src = "images/map_aic_on.gif";
	ImgArray[5].src = "images/map_aic_name_on.gif";
	ImgArray[6].src = "images/map_cle_on.gif";
	ImgArray[7].src = "images/map_cle_name_on.gif";
	ImgArray[8].src = "images/map_kim_on.gif";
	ImgArray[9].src = "images/map_kim_name_on.gif";
	ImgArray[10].src = "images/map_lac_on.gif";
	ImgArray[11].src = "images/map_lac_name_on.gif";
	}
}

function preload_museumsnav() {
if(document.images) {
  var ImgArray = new Array();
  for (var i = 0; i < 19; i++) {
    ImgArray[i] = new Image();
  }    
	ImgArray[0].src = "images/nav_met.gif";
	ImgArray[1].src = "images/nav_met_on.gif";
	ImgArray[2].src = "images/nav_met_title.gif";
	ImgArray[3].src = "images/nav_aic.gif";
	ImgArray[4].src = "images/nav_aic_on.gif";
	ImgArray[5].src = "images/nav_aic_title.gif";
	ImgArray[6].src = "images/nav_cle.gif";
	ImgArray[7].src = "images/nav_cle_on.gif";
	ImgArray[8].src = "images/nav_cle_title.gif";
	ImgArray[9].src = "images/nav_lac.gif";
	ImgArray[10].src = "images/nav_lac_on.gif";
	ImgArray[11].src = "images/nav_lac_title.gif";
	ImgArray[12].src = "images/nav_kim.gif";
	ImgArray[13].src = "images/nav_kim_on.gif";
	ImgArray[14].src = "images/nav_kim_title.gif";
	ImgArray[15].src = "images/nav_mfa.gif";
	ImgArray[16].src = "images/nav_mfa_on.gif";
	ImgArray[17].src = "images/nav_mfa_title.gif";
	ImgArray[18].src = "images/nav_non_title.gif";
  }
}


var timeout_menu;


function on(museum){
	var pic = eval('document.' + museum + '_pic');
	pic.src = "images/map_" + museum + "_on.gif";
	var txt = eval('document.' + museum + '_txt');
	txt.src = "images/map_" + museum + "_name_on.gif";
}

function off(museum){
	var pic = eval('document.' + museum + '_pic');
	pic.src = "images/map_" + museum + ".gif";
	var txt = eval('document.' + museum + '_txt');
	txt.src = "images/map_" + museum + "_name.gif";
}

function on_nav(roll, feature) {
	if(document.images) {
  		clearTimeout(timeout_menu);
		var foo = eval('document.' + feature);
		foo.src = 'images/nav_' + feature + '.gif';
		var bar = eval('document.' + roll);
		bar.src = 'images/nav_' + roll + '_on.gif';
		document.museum.src = 'images/nav_' + roll + '_title.gif';
	}
}


function off_nav(roll, feature) {
	if(document.images) {
		var foo = eval('document.' + roll);
		foo.src = 'images/nav_' + roll + '.gif';
		document.museum.src = 'images/nav_non_title.gif';
   		timeout_menu = setTimeout("reset_menu(\"" + roll + "\",\"" + feature + "\")",100); 
	}
}


function reset_menu(roll, feature){
	if (document.images){
		var baz = eval ('document.' + feature);
		baz.src = 'images/nav_' + feature + '_on.gif';
		document.museum.src = 'images/nav_' + feature + '_title.gif';
	}
}