function Is() { //Klasse fuer Browserdetection
var agent = navigator.userAgent.toLowerCase();
var bes = navigator.appVersion.toLowerCase();

	this.major = parseInt(navigator.appVersion);
	this.minor = parseFloat(navigator.appVersion);

  	this.ns = ((agent.indexOf('mozilla')    != -1) &&
    	       (agent.indexOf('spoofer')    == -1) &&
               (agent.indexOf('compatible') == -1) &&
               (agent.indexOf('opera')      == -1) &&
               (agent.indexOf('webtv')      == -1));
	this.ns2 = (this.ns && (this.major == 2));
  	this.ns3 = (this.ns && (this.major == 3));
  	this.ns4 = (this.ns && (this.major == 4));
  	this.ns6 = (this.ns && (this.major >= 5));

  	this.ie = (agent.indexOf("msie") != -1);
	this.ie3 = (this.ie && (this.major  < 4));
  	this.ie4 = (this.ie && (this.major >= 4) &&
						   !(agent.indexOf("msie 5") != -1));
  	this.ie5 = (this.ie && (this.major == 4) &&
               			   (agent.indexOf("msie 5") != -1));

  	this.ieX = (this.ie && !this.ie3 && !this.ie4);

	//Betriebssystem
	this.mac = (bes.indexOf("macintosh") != -1);
	this.win = (bes.indexOf("win") != -1);

	//Mac IE 5.0
	if(this.mac && this.ie){
	this.macie50 = (this.ie && (this.major == 4) &&
               			   (agent.indexOf("msie 5.0") != -1));
	}

	//AOL User
	this.AOL = (agent.indexOf("aol") != -1);
}

//Globales Objekt fuer die Browserdetection
var is = new Is();

var l_fenster=null;

// Funktionsdefinitionen
function openPopup(breite,hoehe,URL,targetname,xPos,yPos){ //oeffnet ein Javascript Popup

if (l_fenster != null) {
	 if (!l_fenster.closed) l_fenster.close();
	 }
	if(xPos != null && yPos != null){
		l_fenster = window.open(URL,targetname,"width="+breite+",height="+hoehe+",screenX="+xPos+",screenY="+yPos+",left="+xPos+",top="+yPos+",resizable=no,titlebar=no");
	}
	else{
		l_fenster = window.open(URL,targetname,"width="+breite+",height="+hoehe+",resizable=no,titlebar=no");
	}
}