function show(a){
  var e=document.getElementById(a), aux;
  var i;
 
  if(!e)return true;
  for( i = 1; i<= 4; i++){
	  aux = document.getElementById('' + i + '');
	  // aux = $(i + '');
	  if(aux != e && aux != null){
		  aux.fade("out");
		  aux.style.display = "none";
	  }
	  else
	  if(aux != null){		  
		  aux.fade("in");
		  aux.style.display = "block";		  
	  }
  }
  return true;
}