function showhide(id) {
  el= document.getElementById(id);
  if (el.style.display =='none'){
    el.style.display= '';
    el.style.visibility="visible"; 
  }
  else{
    el.style.display= 'none';
    el.style.visibility="hidden"; 
  }
}
function show(id) {
  el= document.getElementById(id);
  el.style.display ='';
  el.style.visibility="visible"; 
}
function hide(id) {
  el= document.getElementById(id);
    el.style.display= 'none';
    el.style.visibility="hidden"; 
}
function darken(id) {
  el= document.getElementById(id);
  el.style.background='#F0F0F0';
}
function brighten(id) {
  el= document.getElementById(id);
    el.style.background="#FAFAFA"; 
}

function shownote(){
hide('websearch');hide('imagesearch');hide('videosearch');hide('newssearch');darken('notebox');brighten('webbox');brighten('imagebox');brighten('videobox');brighten('newsbox');
}

function showweb(){
show('websearch');hide('imagesearch');hide('videosearch');hide('newssearch');brighten('notebox');darken('webbox');brighten('imagebox');brighten('videobox');brighten('newsbox');
}

function showimage(){
hide('websearch');show('imagesearch');hide('videosearch');hide('newssearch');brighten('notebox');brighten('webbox');darken('imagebox');brighten('videobox');brighten('newsbox');
}

function showvideo(){
hide('websearch');hide('imagesearch');show('videosearch');hide('newssearch');brighten('notebox');brighten('webbox');brighten('imagebox'); darken('videobox');brighten('newsbox');
}

function shownews(){
hide('websearch');hide('imagesearch');hide('videosearch');show('newssearch');brighten('notebox');brighten('webbox');brighten('imagebox'); brighten('videobox'); darken('newsbox');
}

function hideall () {for (i = 0; i < arguments.length; i++) {var e = $(arguments[i]); if (e) e.style.display = "none";}}
function showall () {for (i = 0; i < arguments.length; i++) {var e = $(arguments[i]); if (e) e.style.display = "";}}