home = new Image();
home.src = "images/buttons/home.html";
homeRO = new Image();
homeRO.src = "images/buttons/home_over.html";

about = new Image();
about.src = "images/buttons/about.html";
aboutRO = new Image();
aboutRO.src = "images/buttons/about_over.html";

gallery = new Image();
gallery.src = "images/buttons/gallery.html";
galleryRO = new Image();
galleryRO.src = "images/buttons/gallery_over.html";

contact = new Image();
contact.src = "images/buttons/contact.html";
contactRO = new Image();
contactRO.src = "images/buttons/contact_over.html";

references = new Image();
references.src = "images/buttons/references.html";
referencesRO = new Image();
referencesRO.src = "images/buttons/references_over.html";


function over(item) {
    document.getElementById(item).src=eval(item+"RO").src;

}
function out(item) {
    document.getElementById(item).src=eval(item).src;
}