// JavaScript Document
//display: none; #to hide an item and give it no position;
//visibility: hidden; #to hide an item but leave it on its place;
//with: diplay: block/inline/auto(?) or visibility visible you can make it visible.. 
 

function toggle_visibility(id) {
       var e = document.getElementById(id);
       if(e.style.display == 'none')
          e.style.display = 'block';
       else
          e.style.display = 'none';
}