function ShowBox1(){
  document.getElementById("secondbox").style.visibility = 'visible';
  document.getElementById("secondbox").style.display = 'block';
  return false;
}

function Show(divId) {
    listoflinks = new Array('Video', 'Sound', 'Motherboard', 'DVD', 'Wireless', 'Ethernet', 'Monitor', 'Webcam', 'Printer');

    for (i = 0; i < listoflinks.length; i++) {
        document.getElementById(listoflinks[i]).style.visibility = 'hidden';
        document.getElementById(listoflinks[i]).style.display = 'none'
    }
    document.getElementById(divId).style.visibility = 'visible';
    document.getElementById(divId).style.display = 'block';
    return false
}