function popup(name,datei,w,h,x,y,forceSize){  
	if(  typeof name == 'object' ){
	  datei= name.href;
	  name= name.target; 
	}
	
	w=(w) ? w : 200;
	h=(h) ? h : 200;
	x=(x) ? x : (screen.availWidth -w)/2;
	y=(y) ? y : (screen.availHeight-h)/2;
	
	if(!top.fenster){
	  top.fenster=new Object();
	}
	if(top.fenster[name] && !top.fenster[name].closed){
		top.fenster[name].location.href=datei;
	}
	else{
//		top.fenster[name]=window.open(datei,name,'toolbar=no,location=yes,scrollbars=yes,status=yes,menubar=no,resizable=yes,left='+x+',top='+y+',width='+w+',height='+h);
		top.fenster[name]=window.open(datei,name,'dependent=yes,toolbar=no,location=no,scrollbars=yes,status=yes,menubar=no,resizable=yes,left='+x+',top='+y+',width='+w+',height='+h);
		if(forceSize){
  		top.fenster[name].resizeTo(w,h);
  		top.fenster[name].moveTo(x,y);
	  }
	}
//	alert(name);
	top.fenster[name].focus();
}

top.fenster=new Object();