function f_in(which){
  document.getElementById(which).src='img/nav/'+which+'_h.gif';
  return;
}
function f_out(which){
  document.getElementById(which).src='img/nav/'+which+'_n.gif';
  return;
}
function qj_in(which){
  document.getElementById(which).src='img/qj/'+which+'_h.jpg';
  return;
}
function qj_out(which){
  document.getElementById(which).src='img/qj/'+which+'_n.jpg';
  return;
}