function changeImage (value) {
var header = document.getElementById('header');
switch (value) {
case "start": header.style.backgroundPosition = "0 0"; break;
case "products": header.style.backgroundPosition = "0 250px"; break;
case "service": header.style.backgroundPosition = "0 750px"; break;
case "projects": header.style.backgroundPosition = "0 500px"; break;
}
}
function openMainNavigation () {
var element = document.getElementById('mainNavigation');
element.morph('height:215px;',{queue:'end'});
element.style.cursor = "default";
var nodes = document.getElementsByClassName('sub');
for (i=0; i<nodes.length; i++) {
nodes[i].style.display = "block";
nodes[i].style.visibility = "visible"; 
}
}
function swapImage (imgName, swapImage, text) {
document.images[imgName].src = '/viomatrix/imgs/referenzen/' + swapImage;
document.getElementById('pictureDiscribtion').innerHTML = text;
}
function changeBackgroundColor (value,color) {
var element = document.getElementById(value);
element.morph('background-color:#' + color + ';', {duration:0.4});
}