/*------------------------------------------------------------------------------------------*\
  Layerbehandlung

	
	Mit diesen Funktionen kann eine mehrschichtige Navi angesteuert werden, die
	der Menüfunktionalität von OS wie MAC oder WIN ähnelt.
	
	Die Fkt. over und out bewirken eine Einfärbung der ausgewählten Unterpunkte,
	nicht nur den Text sondern der kompletten Zeile.

\*------------------------------------------------------------------------------------------*/


//--------------------------------------------------------------------------------------------\\
// und hier haben wir den farbwechsel in menues
//--------------------------------------------------------------------------------------------\\
var color = '';

function over(ly, id) {
    if (document.layers) {
        window.color = window.document.layers[ly].document.layers[id].bgColor;
	      window.document.layers[ly].document.layers[id].bgColor = '#999999';
    }
    else if (document.all) {
        window.color = window.document.all[id].style.background;
        window.document.all[id].style.background = '#999999';
    }
}

function out(ly, id) {
    if (document.layers)
        window.document.layers[ly].document.layers[id].bgColor = window.color;
    else if (document.all)
        window.document.all[id].style.background = '#e1e1e1';
}




//--------------------------------------------------------------------------------------------\\
//die layersteuerung an sich....
//--------------------------------------------------------------------------------------------\\
var active = 0;

function activate() {
	active = 1;
}

bOK = (document.all || document.layers || document.getElementById);

layerList = new Array();

layerList[0] = "lydv";
layerList[1] = "lyak";
layerList[2] = "lyter";
layerList[3] = "lyausbildung";
layerList[4] = "lyhlt";
var section = "home";
var actLayer = "none";


if (document.layers) {
	layerVar = "document.layers"; styleVar = ""; visVar = "show";
} else if (document.all) {
	layerVar = "document.all"; styleVar = ".style"; visVar = "visible";
}

function showLayer(num){
	if (bOK && active) {
		actLayer = layerList[num];
		hideAllLayers();
		if (document.all || document.layers) {
			eval(layerVar + '["' + layerList[num] + '"]' + styleVar + '.visibility="visible"');
		} else if (document.getElementById) {
			thisLayer = document.getElementById(layerList[num]);
			thisLayer.style.visibility = "visible";
		}
	}
}
     
function hideLayer(num){
	if (bOK && active) {
		if (document.all || document.layers) {
			eval(layerVar + '["' + layerList[num] + '"]' + styleVar + '.visibility="hidden"');
		} else if (document.getElementById) {
			thisLayer = document.getElementById(layerList[num]);
			thisLayer.style.visibility = "hidden";
		}
	}
}

function hideAllLayers() {
	if (bOK && active) {
		var actLayer = "none";
		for (i = 0; i < layerList.length; i++) hideLayer(i);
		clearTimeout(menuTimer);
	}
}

menuTimer = setTimeout("clearAll()",750);

function clearMenus() {
	menuTimer = setTimeout("clearAll()",750);
}

function clearAll() {
	var actLayer = "none";
	hideAllLayers();
}