if (document.images) { // browser supports image swaps, preload images
    var menuOutButtons = new Array();
    menuOutButtons[0] = new Image();
    menuOutButtons[0].src = "btn-home.gif";
    menuOutButtons[1] = new Image();
    menuOutButtons[1].src = "btn-approach.gif";
    menuOutButtons[2] = new Image();
    menuOutButtons[2].src = "btn-programs.gif";
    menuOutButtons[3] = new Image();
    menuOutButtons[3].src = "btn-resources.gif";
    menuOutButtons[4] = new Image();
    menuOutButtons[4].src = "btn-contact.gif";
    menuOutButtons[5] = new Image();
    menuOutButtons[5].src = "btn-training.gif";

    var menuOverButtons = new Array();
    menuOverButtons[0] = new Image();
    menuOverButtons[0].src = "btn4-home.gif";
    menuOverButtons[1] = new Image();
    menuOverButtons[1].src = "btn4-approach.gif";
    menuOverButtons[2] = new Image();
    menuOverButtons[2].src = "btn4-programs.gif";
    menuOverButtons[3] = new Image();
    menuOverButtons[3].src = "btn4-resources.gif";
    menuOverButtons[4] = new Image();
    menuOverButtons[4].src = "btn4-contact.gif";
    menuOverButtons[5] = new Image();
    menuOverButtons[5].src = "btn4-training.gif";
}

function lite(n) {
  if (document.images) document.images["menu"+n].src = menuOverButtons[n].src;
}

function unlite(n) {
  if (document.images) document.images["menu"+n].src = menuOutButtons[n].src;
}