function popup (url) {
 fenster = window.open(url, 'popup', "width=720,height=430,resizable=yes,scrollbars=no, toolbar=no,status=no,menubar=no,location=0,top=150,left=150");
 fenster.focus();
 return false;
}

function popup_youtube (url) {
 fenster = window.open(url, 'popup', "width=660,height=405,resizable=yes,scrollbars=no, toolbar=no,status=no,menubar=no,location=0,top=200,left=200");
 fenster.focus();
 return false;
}

function popup_survey (url) {
 fenster = window.open(url, 'popup', "width=720,height=430,resizable=yes,scrollbars=yes, toolbar=no,status=no,menubar=no,location=0,top=150,left=150");
 fenster.focus();
 return false;
}

function ShowHide(id) {
obj = document.getElementsByTagName("div");
obj[id].style.visibility = 'hidden';
if (obj[id].style.visibility == 'visible'){
obj[id].style.visibility = 'hidden';
obj[id].style.height = '0px';
}
else {
obj[id].style.visibility = 'visible';
obj[id].style.height = 'auto';
}
}

function Show(id) {
obj = document.getElementsByTagName("div");
obj[id].style.visibility = 'visible';
}
function Hide(id) {
obj = document.getElementsByTagName("div");
obj[id].style.visibility = 'hidden';
}