//preload images
var furniture_off = new Image();
var furniture_on = new Image();
var interior_off = new Image();
var interior_on = new Image();
var contact_off = new Image();
var contact_on = new Image();
var home_off = new Image();
var home_on = new Image();
var furn_tables_off = new Image();
var furn_tables_on = new Image();
var furn_seating_off = new Image();
var furn_seating_on = new Image();
var furn_objects_off = new Image();
var furn_objects_on = new Image();
var furn_beds_off = new Image();
var furn_beds_on = new Image();
var furn_mirrors_off = new Image();
var furn_mirrors_on = new Image();
var furn_lighting_off = new Image();
var furn_lighting_on = new Image();
var furn_cabinets_off = new Image();
var furn_cabinets_on = new Image();
var furn_bookcases_off = new Image();
var furn_bookcases_on = new Image();
var furn_misc_off = new Image();
var furn_misc_on = new Image();
var furn_unique_off = new Image();
var furn_unique_on = new Image();
var interior_arch_off = new Image();
var interior_arch_on = new Image();
var interior_dec_off = new Image();
var interior_dec_on = new Image();

furniture_off.src = "images/nav_furniture_off.gif";
furniture_on.src = "images/nav_furniture_on.gif";
interior_off.src = "images/nav_interior_off.gif";
interior_on.src = "images/nav_interior_on.gif";
contact_off.src = "images/nav_contact_off.gif";
contact_on.src = "images/nav_contact_on.gif";
home_off.src = "images/nav_home_off.gif";
home_on.src = "images/nav_home_on.gif";
furn_tables_off.src = "images/nav_furniture_tables_off.gif";
furn_tables_on.src = "images/nav_furniture_tables_on.gif";
furn_seating_off.src = "images/nav_furniture_seating_off.gif";
furn_seating_on.src = "images/nav_furniture_seating_on.gif";
furn_objects_off.src = "images/nav_furniture_objects_off.gif";
furn_objects_on.src = "images/nav_furniture_objects_on.gif";
furn_beds_off.src = "images/nav_furniture_beds_off.gif";
furn_beds_on.src = "images/nav_furniture_beds_on.gif";
furn_mirrors_off.src = "images/nav_furniture_mirrors_off.gif";
furn_mirrors_on.src = "images/nav_furniture_mirrors_on.gif";
furn_lighting_off.src = "images/nav_furniture_lighting_off.gif";
furn_lighting_on.src = "images/nav_furniture_lighting_on.gif";
furn_cabinets_off.src = "images/nav_furniture_cabinets_off.gif";
furn_cabinets_on.src = "images/nav_furniture_cabinets_on.gif";
furn_bookcases_off.src = "images/nav_furniture_bookcases_off.gif";
furn_bookcases_on.src = "images/nav_furniture_bookcases_on.gif";
furn_misc_off.src = "images/nav_furniture_misc_off.gif";
furn_misc_on.src = "images/nav_furniture_misc_on.gif";
furn_unique_off.src = "images/nav_furniture_unique_off.gif";
furn_unique_on.src = "images/nav_furniture_unique_on.gif";
interior_arch_off.src = "images/nav_interior_arch_off.gif"
interior_arch_on.src = "images/nav_interior_arch_on.gif"
interior_dec_off.src = "images/nav_interior_dec_off.gif";
interior_dec_on.src = "images/nav_interior_dec_on.gif";

function switchImg(which, newImg){
	document.images[which].src = newImg.src;
}

function displayNav(which, toggle){
	if (toggle){
		document.getElementById(which + "Nav").style.display = "block";
		document.getElementById(which + "NavUnder").style.display = "block";
	  	switchImg(which, eval(which + "_on"));
	} else {
		document.getElementById(which + "Nav").style.display = "none";
		document.getElementById(which + "NavUnder").style.display = "none";
		switchImg(which, eval(which + "_off"));
	}
}