function divChg(nu,gr) {

  if (nu==1){
  document.getElementById(gr+'1').background="images/titlebg_white.gif";
  document.getElementById(gr+'2').background="images/titlebg_grey.gif";
 
  document.getElementById(gr+'d1').style.display='';
  document.getElementById(gr+'d2').style.display='none';

  }else if(nu==2){
  document.getElementById(gr+'1').background="images/titlebg_grey.gif";
  document.getElementById(gr+'2').background="images/titlebg_white.gif";
 
  document.getElementById(gr+'d1').style.display='none';
  document.getElementById(gr+'d2').style.display='';


  }
  
}