var docroot = "";
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){
	var bildpfad = docroot + bildpfad;
	document.getElementById("kopfpicbg").style.backgroundImage = "url(" + bildpfad + ")";
	setTimeout("switchKopfpic()", 3000);
}

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

function switchKopfpic(){
	document.getElementById("kopfpic").style.display = "none";
	var bildpfad = docroot + "bilder/layout/kopfpic/";
	var zufall =  Math.round(Math.random()*20+1);
	resObjekt.open('get', docroot + 'include/switchkopfpic.php?do=switch&bild='+bildpfad+zufall,true);
	resObjekt.onreadystatechange = handleResponse;
	resObjekt.send(null);
	setTimeout("appearKopfpic(" + zufall + ")", 3000);
}

function appearKopfpic(zufall){
	//Überprüfen ob Ajax-Objekt fertig geladen ist.
	if(!(resObjekt.readyState == "4")) setTimeout("appearKopfpic()", 0);
	else{
		new Effect.Appear(document.getElementById("kopfpic"), 3000);
		setTimeout("switchKopfpicbg(" + zufall + ")", 3000);
		setTimeout("switchKopfpic()", 3000);
	}
}

function setFontSize(size){
	document.getElementById("content").style.fontSize = size + "em";
	document.getElementById("box_right").style.fontSize = size + "em";
	document.getElementById("footer").style.fontSize = size + "em";
	document.getElementById("navi").style.fontSize = size + "em";
	document.getElementById("quote").style.fontSize = size + "em";
	if(document.getElementsByTagName("table")[0]) document.getElementsByTagName("table")[0].style.fontSize = size + "em";
	document.getElementsByTagName("h2")[0].style.fontSize = size + 0.4 + "em";
	document.getElementsByTagName("h3")[0].style.fontSize = size + 0.4 + "em";
}

function showMeldung(msg){
  var dim = document.getElementById('dim_bg');
  var meldung = document.getElementById('meldung');
  var meldungtext = document.getElementById('meldungtext');
  dim.style.height = document.body.scrollHeight;
  dim.style.display = "block";
  meldung.style.top = ((screen.availHeight-190)/2)+document.body.scrollTop;
  meldungtext.innerHTML = msg;
  meldung.style.display = "block";
}

function setMenu(nav){
	document.getElementById(nav + "Menu").style.display = "block";
	document.getElementById(nav + "Menu").style.zIndex = "1";
	document.getElementById(nav + "Entry").style.zIndex = "2";
	document.getElementById(nav + "Entry").style.backgroundColor = "#A0B1CB";
}

function unsetMenu(nav){
	document.getElementById(nav + "Menu").style.display = "none";
	document.getElementById(nav + "Menu").style.zIndex = "0";
	document.getElementById(nav + "Entry").style.zIndex = "0";
	document.getElementById(nav + "Entry").style.backgroundColor = "";
}

function setMenuEntry(nav_menu_entry){
	document.getElementById(nav_menu_entry).style.backgroundColor = "#01295B";
	document.getElementById(nav_menu_entry).style.color = "#FFFFFF";
}

function unsetMenuEntry(nav_menu_entry){
	document.getElementById(nav_menu_entry).style.backgroundColor = "#A0B1CB";
	document.getElementById(nav_menu_entry).style.color = "#FFFFFF";
}