// JavaScript Document

    var current = 'one'
    function show(id) {
      document.getElementById(current).style.visibility = 'hidden';
      document.getElementById(id).style.visibility = 'visible';
      current = id;
    }


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

window.onload = function () {
	show();
	toggle_visibility();
}