/* =================================================================*/
//
// Automatische Site-Navigation mit dynamisch erzeugtem Javascript 
//
// (c) Nov 1999 Marco Zierl Kontakt: mzierl@gmx.net
//
//var root_directory = "file:///m|/daten/webseiten_beendet/roscher2";
var root_directory = "";
var image_dir = "/buttons/";
var default_height = 18;
var default_width = 100;
var mouseover_extension = "_pr";
var default_menu = new Array('index', 'uebuns' , 'pplan', 'durchf', 'pflege', 'baumschu', 'remeboe', 'referenz', 'aktuell', 'kontakt' );
var html_extension = ".html";
var mouseover_effects = true; // oder false;
var file_type = ".gif"; 


var MenuEntries=new Object();
var current_entry =0;


function add_subentry(name, mother, link){
	if(MenuEntries[mother].child_counter == null){
		MenuEntries[mother].child_counter=0;
		MenuEntries[mother].children = new Array();
	}
	var child_count = MenuEntries[mother].child_counter;
	MenuEntries[mother].children[child_count]=name;
	MenuEntries[mother].child_counter++;

	if(! link){
		add_entry(name);
	} else {
		add_entry(name, link);
	}	
	MenuEntries[name].mother = mother;
}

function add_entry(name, link){ //, image, link, alt, image_h){
	MenuEntries[name] = new Object();
	MenuEntries[name].name = name;
	MenuEntries[name].image = name;
	if(mouseover_effects == true){
		MenuEntries[name].image_h = name + mouseover_extension;
	}
	MenuEntries[name].alt = name;
	if(!link){
		MenuEntries[name].link = root_directory + "/" + name + html_extension;
	} else {
		MenuEntries[name].link = root_directory + "/" + link;
	}		

	if(mouseover_effects == true){

		eval(name + '= new Image()');
		eval(name + '.src="' + root_directory + image_dir + MenuEntries[name].image + file_type + '"'); 
		eval(name + '_h= new Image()');
		eval(name + '_h.src="' + root_directory + image_dir + MenuEntries[name].image_h + file_type + '"'); 
	}
	current_entry++;
}


function build_nav(page_menu, highlight){

	var mother="";

	if(highlight != null){
		if(MenuEntries[highlight].mother != null){
			mother = MenuEntries[highlight].mother;
		}
	}
	
	for(i=0; i< page_menu.length; i++){
		var current_entry = page_menu[i];
		
		// link und image tags schreiben (mit document.write
		write_html(current_entry, highlight);

		if(current_entry == mother){
			for(var j=0; j<MenuEntries[current_entry].children.length; j++){
				write_html(MenuEntries[current_entry].children[j], highlight);						
			}
		}

		if(MenuEntries[current_entry].name == highlight &&
			MenuEntries[current_entry].child_counter != null){

			for(var j=0; j<MenuEntries[current_entry].children.length; j++){
				write_html(MenuEntries[current_entry].children[j], highlight);						

			}
		}
	}
}

/* ------------------------------------------------------------------*/
// write_html()
//
// ausgabe des html-codes für die navigationsleiste
// - nehmen Sie hier Änderungen vor, wenn Sie z.B. die Ausgabe der
//  Navigationsleiste als Tabelle oder div-Container möchten
//
// - zur Zeit werden für jeden eintrag die folgenden tags ausgegeben:
//   <a href=.... onmouseover...> <img src=...> </a> <br>
/* ------------------------------------------------------------------*/

function	write_html(current_entry, highlight){
		var extension = "";
		var curr_name = MenuEntries[current_entry].name;
		// abprüfen, ob eintrag als ausgewählt angezeigt wird
		if(curr_name == highlight){
			extension = mouseover_extension; // highlight grafik 
		}
				
		// höhe und breite der grafik setzen
		if(!MenuEntries[current_entry].height ){
			height = default_height;
		} else {
			height = MenuEntries[current_entry].height;
		}

		if(!MenuEntries[current_entry].width ){
			width = default_width;
		} else {
			width = MenuEntries[current_entry].width;
		}

		output="";

		// html Ausgabe erzeugen
		if(MenuEntries[current_entry].name != highlight){

			// <a> Tag aufbauen: href
			output = '<a href="' + MenuEntries[current_entry].link + '"';
			if(mouseover_effects == true ){
				// mouse events einfügen
				output+= ' onMouseOver="ch(\'' + curr_name + '\',\'' + curr_name;
				output+= '_h\'); return true"';
				output+= ' onMouseOut="ch(\'' + curr_name + '\',\'' + curr_name;
				output+= '\'); return true"';
			}
			output += '>';
		}

		// image tag aufbauen- src, height, width  und alt
		output += '<img src="' + root_directory + image_dir + MenuEntries[current_entry].image;
		output += extension + '.gif" height=' + height;
		output += ' width="' + width + '" border=0 alt="';
		output += MenuEntries[current_entry].alt + '" name="' + curr_name;
		output += '"></a><br>';

		document.write(output);
}

/* ------------------------------------------------------------------*/
// ch()
//
// Funktion zum Austauschen der Grafiken beim mousover / mouseout 
/* ------------------------------------------------------------------*/

function ch(im,sr) {
	eval('document.'+im+'.src='+sr+'.src');
}