function entrance(qw)	{

	var noborder = 0; 
	if (navigator.userAgent.indexOf("MSIE") == -1) {
		var oben = "screenY=0,";
		var links = "screenX=0";
		var scroll = "scrollbars=1";		
	} else {
		var oben = "top=0,";
		var links = "left=0";
		var client = "msie";
		if (navigator.userAgent.indexOf("Mac") == -1) {
			var scroll = "scrollbars=yes";
		} else {
			var scroll = "scrollbars=auto";
		}	
	}
	var parstr = '';
	if(client == "msie" & noborder == 1){
		parstr += 'fullscreen=1,';
	} else {
		if(screen.availHeight <= 730){
			parstr += 'width=790,';
			parstr += 'height=540,';
			var lowres = 1;
		} else {
			parstr += 'width=790,';
			parstr += 'height=600,';
			var lowres = 0;
		}
	}
	parstr += oben;
	parstr += links;
	parstr += ',status=0';
	parstr += ',menuebar=0,';
	parstr += scroll;
	parstr += ',resizable=yes';
	parstr += ',toolbar=0';
	parstr += ',location=0';
	parstr += ',directories=0';
	if (qw == 1) {
		var starturl = '../../../../b-interaktiv/prog/leer_en.php?lowres=';
	} else {	
		var starturl = '../../../../b-interaktiv/prog/leer.php?lowres=';
	}
	starturl += lowres;
	neufenster = open(starturl,'fenster1',parstr);
	if(client == "msie" & noborder == 1){
		neufenster.resizeTo(800,600);
	}
	if(screen.availWidth <= 800){
		neufenster.moveTo(0,0);
	} else {
		neufenster.moveTo(20,20);
	}
	neufenster.focus();
	fenster = true;
}