function changeBg(id){document.getElementById(id).style.backgroundImage = "url(./img/menu2.jpg)";}
function changeBgBack(id){document.getElementById(id).style.backgroundImage = "url(./img/menu.jpg)";}
function changeColor(id){document.getElementById(id).style.backgroundColor = "#FFFFFF";}
function changeColorBack(id){document.getElementById(id).style.backgroundColor = "#DDDDDD";}