//	Öffnet ein neues Fenster
function openWindow(desktopURL, w, h){               
	var openAction = window.open(desktopURL, "_blank", "toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no,top=150,left=150,width="+(w)+",height="+(h) );
}

function switchItemVisibility(idName) {
	if(document.getElementById(idName).style.display != 'block') {
		document.getElementById(idName).style.display = 'block';
	} else {
		document.getElementById(idName).style.display = 'none';
	}
}

function displayGallery (i) {
    if(i != 0) {
        document.getElementById('galleryNav').style.display = 'none';
        document.getElementById('galleryBack').style.display = 'block';
    } else {
         document.getElementById('galleryNav').style.display = 'block';
         document.getElementById('galleryBack').style.display = 'none';
    }
    
    
    for (var j = 1; j <= 3; j++) {
            if(i != j) {
                document.getElementById('gallery_' + j).style.display = 'none';
            } else {
                document.getElementById('gallery_' + j).style.display = 'block'; 
            }
        }   
}