var scharf = false;
function popUp() {
    window.open( psu+'su/umfrage.php', 'umpu', 'height=485, width=370, dependent=no, location=no, menubar=no, resizable=no, scrollbars=no, status=no, toolbar=no');
}

function checkPopUp() {
    if (scharf) popUp();
}

function checkScharf() {
	scharf = true;
}

function resetScharf(){
	scharf = false;
}