function openLoginScreen() {
    URL = "/gastgeber/login.php";
    winName = "Anmelden";
    features = "toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no";
    winHeight= 250;
    winWidth = 600;
    
    var loginscreen= window.open(URL,winName,features + ',height=' + winHeight + ',width=' + winWidth + ',screenY=100,screenX=140,top=100,left=140');
	
}
function openGrossAnsicht(strURL,strWidth,strHeight) {
    winName = "GrossAnsicht";
    features = "toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no";
    winHeight= strHeight + 230;
    winWidth = strWidth + 20;
    if ( winWidth < 300 ) {winWidth = 300 };
    
    var GrossAnsicht= window.open(strURL,winName,features + ',height=' + winHeight + ',width=' + winWidth + ',screenY=100,screenX=140,top=100,left=140');

}