function PortfolioOeffnen(portfolio){
	var url = "portfolio/"+portfolio;
	var breite = 1300;
	var hoehe = 800;
	BrowserName=navigator.appName;
	BrowserVersion=parseInt(navigator.appVersion);
	if(BrowserName=="Netscape"){
		fbreite = screen.availWidth-8;
		fhoehe = screen.availHeight-45;
	}
	else{
		fbreite = screen.availWidth;
		fhoehe = screen.availHeight;
	}
	var l = (fbreite - breite) / 2;
	var t = (fhoehe - hoehe) / 2;
	popup = window.open(url,"Portfolio","resizable=yes,menubar=no,toolbar=no,location=no,status=no,height="+hoehe+",width="+breite+",scrollbars=auto,left="+l+",top="+t); 
}