// JavaScript Document
 var isvisible = false;
 var delay = 200;
 var cmover = "#ffffff";
 var cmout = "#000000";
 var oldcs;
 
 var int;
 
 function show(cs) {
  if ((oldcs != cs) && (oldcs != undefined)) {
   clearTimeout(window.int);  
   really_hide(oldcs);
  }
  oldcs = cs;
  isvisible = true;
  document.getElementById(cs).style.display = "block";
  document.getElementById(cs+"_h").style.display = "block";
  clearTimeout(window.int);
 }
 
 function really_hide(cs) {
  if (isvisible) {
   document.getElementById(cs).style.display = "none";
   document.getElementById(cs+"_h").style.display = "none";   
  }  
  isvisible = false;  
 } 
 
 function hide(cs) {
  window.int = setTimeout("really_hide('"+cs+"')",delay);
 }
 
 function show_hide(w) {
  if (w == 2) show('courses_box');
  if (w == 3) show('abox');
 }