var menu_aktiv = "";
var resObjekt;

resObjekt = createXMLHttpRequest();

//Portable Funktion zum Erzeugen eines XMLHttpRequest-Objekts
function createXMLHttpRequest() {
  var req = null;
  try {
    req = new ActiveXObject("MSXML2.XMLHTTP");
  }
  catch (err_MSXML2) {
    try {
      req = new ActiveXObject("Microsoft.XMLHTTP");
    }
    catch (err_Microsoft) {
      if (typeof XMLHttpRequest != "undefined") 
        req = new XMLHttpRequest;
    }
  }
  return req;
}

function handleResponse(){
	if(resObjekt.readyState == 4){
		if(resObjekt.responseText == "refresh") location.replace('./');
		else document.getElementById("kopfpic").innerHTML = resObjekt.responseText;
	}
}

function loadKopfpicbg(bildpfad){
	document.getElementById("kopfpicbg").style.backgroundImage = "url(" + bildpfad + ")";
	setTimeout("switchKopfpic()", 2000);
}

function switchKopfpicbg(zufall){
	var bildpfad = "bilder/layout/kopfpic/" + zufall + ".jpg";
	document.getElementById("kopfpicbg").style.backgroundImage = "url(" + bildpfad + ")";
}

function switchKopfpic(){
	document.getElementById("kopfpic").style.display = "none";
	var bildpfad = "bilder/layout/kopfpic/";
	var zufall =  Math.round(Math.random()*4+1);
	resObjekt.open('get', 'include/switchkopfpic.php?do=switch&bild='+bildpfad+zufall,true);
	resObjekt.onreadystatechange = handleResponse;
	resObjekt.send(null);
	setTimeout("appearKopfpic(" + zufall + ")", 2000);
}

function appearKopfpic(zufall){
	//Überprüfen ob Ajax-Objekt fertig geladen ist.
	if(!(resObjekt.readyState == "4")) setTimeout("appearKopfpic()", 0);
	else{
		new Effect.Appear(document.getElementById("kopfpic"), 1000);
		setTimeout("switchKopfpicbg(" + zufall + ")", 1000);
		setTimeout("switchKopfpic()", 1000);
	}
}

function setFontSize(size){
	for (var i = 0; i < document.getElementsByTagName("td").length; i++) {
  	document.getElementsByTagName("td")[i].style.fontSize = size + "em";
  }
}

function changeImagesArray(array) {
	//if (preloadFlag == true) {
		var d = document; var img;
		for (var i=0; i<array.length; i+=2) {
			img = null; var n = array[i];
			if (d.images) {img = d.images[n];}
			if (!img && d.getElementById) {img = d.getElementById(n);}
			if (img) {img.src = array[i+1];}
		}
	//}
}

function changeImages() {
	changeImagesArray(changeImages.arguments);
}