if (document.images) {
   home = new Image(); home.src = "../img/menu-home-on.png";
   prof = new Image(); prof.src = "../img/menu-prof-on.png";
   blog = new Image(); blog.src = "../img/menu-blog-on.png";
   text = new Image(); text.src = "../img/menu-text-on.png";
   love = new Image(); love.src = "../img/menu-love-on.png";
}
function setImage(img, image) {
   if (img) {
      img.src = image;
   }
}