function sellay4(num){
 for(var id = 1;id<=2;id++)
 {
  var cc="my4title"+id;
  var bb="my4list"+id;
    if(id==num)
  document.getElementById(cc).className="active_a";
  else
  document.getElementById(cc).className="";
  
  if(id==num)
  document.getElementById(bb).className="text_aa";
  else
  document.getElementById(bb).className="text_a";
 }
  
}