// script to preload and control navigation background images
// var timeout_id value of the started timeout
// var nav_pos stored image names without gif and id's of images in document
// var images_arr preload array
// var nohide_arr permanent shown images
// function swap_image(docimg,imgarr) replace a preloaded image
// function navhide_all() hides replaces all navigation background images except nohide_arr[] with transparent pix
// function nav_mouse(docimg) replaces background transparent with navigation background, resets navigation and timeout
// function nav_show(docimg) shows navigation background permanent
// function nav_hide() starts timeout to hide_all in 2000mS
// input docimg number of image in document array
// input imgarr number of image in images array

var timeout_id=0;

// preload navigation backgrounds
var nav_pos = new Array('profil','projekte','angebot','galerie');
var images_arr = new Array();
var nohide_arr = new Array(); 

// topnav
for (i in nav_pos) {
	name = nav_pos[i];
	nameover = name + "over";
	nameout = name + "out";
	nohide_arr[name]=false;
	images_arr[nameover]=new Image;
	images_arr[nameover].src= "../../_buttons/"+nav_pos[i]+"_over.gif";
	images_arr[nameout]=new Image;
	images_arr[nameout].src="../..//_buttons/"+nav_pos[i]+"_out.gif";
}

// define image swap function
function swap_image (docimg,imgarr) {
	if (nn4) {
		document.layers["indinav"].document.images[docimg].src = images_arr[imgarr].src;
	}
	else {
		document.images[docimg].src = images_arr[imgarr].src;
	}
}

// hide all navigation
function navhide_all () {
	if (timeout_id>0) {
		clearTimeout(timeout_id);
		timeout_id=0;
	}
	hide_layers("indinav");
	for (i in nav_pos) {
		name = nav_pos[i];
		nameover = name + "over";
		nameout = name + "out";
		namelay = "lay" + name;
		if (!nohide_arr[name]) {
			swap_image (name,nameout);
		}
		else {
			show_layer(namelay,"indinav");
		}
	}
}

function nav_hide () {
   	timeout_id = setTimeout ('navhide_all()','2000');
}

// show navigation
function nav_mouse (name) {
//	navhide_all ();
	if (timeout_id>0) {
		clearTimeout(timeout_id);
		timeout_id=0;
	}
	hide_layers("indinav");
	nameover = name + "over";
	namelay = "lay" + name;
	swap_image (name,nameover);
	show_layer(namelay,"indinav");
}

// show navigation initial memory
function nav_show (name) {
	nohide_arr[name] = true;
	nav_mouse (name);
}

function subnav_mouse () {
	if (timeout_id>0) {
		clearTimeout(timeout_id);
		timeout_id=0;
	}
}