// Referenz eines Div-Blockes ermitteln
function div_ref (id) {
    if      (document.layers)         return document.layers[id];         // NC 4
    else if (document.all)            return document.all[id];            // IE 4
    else if (document.getElementById) return document.getElementById(id); // DOM
    else                              return null;        
}

// Fensterhoehe ermitteln
function fensterhoehe()
{
 	if (window.innerHeight) return window.innerWidth;
 	else if (document.body && document.body.offsetHeight) 
  	return document.body.offsetHeight;
 	else return 0;
}

/* Popup-Fenster */
var win=null;

function PopUp(mypage,myname,w,h,scroll,pos){
	if(pos=="random"){LeftPosition=(screen.width)?Math.floor(Math.random()*(screen.width-w)):100;TopPosition=(screen.height)?Math.floor(Math.random()*((screen.height-h)-75)):100;}
	if(pos=="center"){LeftPosition=(screen.width)?(screen.width-w)/2:100;TopPosition=(screen.height)?(screen.height-h)/2:100;}
	else if((pos!="center" && pos!="random") || pos==null){LeftPosition=0;TopPosition=20}
	settings='width='+w+',height='+h+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no';
	win=window.open(mypage,myname,settings);
}
  
var refInterval = 300;

// Countdown
function startCounter()
{
	var txt_ref = div_ref('countdown');
	if (txt_ref != null) {
		refInterval = refInterval - 1;
		var now = new Date();
		var dummystring = parseInt(now.getTime() / 1000);
		if (refInterval < 1) {
			location.reload();
			refInterval = 300;
		}
		txt_ref.innerHTML= "Automatische Aktualisierung in <b>"+refInterval+"</b> Sekunden.";
		timerID = setTimeout("startCounter()", 1000);
	}
}
  
// Initialisierung
function init()
{
	startCounter();	
}