function ChangeA(num)
{
 for(var id = 1;id<=3;id++)
 {
  var ss="aa"+id; 
  if(id==num)
  document.getElementById(ss).style.display="block";
  else
  document.getElementById(ss).style.display="none";
 }  
 
 for(var id = 1;id<=3;id++)
 {
  var bb="lia"+id;
  if(id==num)
  document.getElementById(bb).className="active";
  else
  document.getElementById(bb).className="";
 } 
 
}
function ChangeB(num)
{
 for(var id = 1;id<=3;id++)
 {
  var ss="bb"+id; 
  if(id==num)
  document.getElementById(ss).style.display="block";
  else
  document.getElementById(ss).style.display="none";
 }  
 
 for(var id = 1;id<=3;id++)
 {
  var bb="lib"+id;
  if(id==num)
  document.getElementById(bb).className="active";
  else
  document.getElementById(bb).className="";
 } 
 
}