if (document.images)
{
  b1off= new Image;
  b1off.src="images/b_home.gif"; 
  b2off= new Image;
  b2off.src="images/b_solutions.gif"; 
  b3off= new Image;
  b3off.src="images/b_seminars.gif"; 
  b5off= new Image;
  b5off.src="images/b_about.gif"; 
  b6off= new Image;
  b6off.src="images/b_clients.gif"; 
  b7off= new Image;
  b7off.src="images/b_contact.gif"; 
  b8off= new Image;
  b8off.src="images/b_software.gif"; 
  b9off= new Image;
  b9off.src="images/b_argenti.gif"; 
  b10off= new Image;
  b10off.src="images/b_club.gif"; 
  b11off= new Image;
  b11off.src="images/b_store.gif"; 

  b1on= new Image;
  b1on.src="images/b_home_ov.gif"; 
  b2on= new Image;
  b2on.src="images/b_solutions_ov.gif"; 
  b3on= new Image;
  b3on.src="images/b_seminars_ov.gif";
  b5on= new Image;
  b5on.src="images/b_about_ov.gif"; 
  b6on= new Image;
  b6on.src="images/b_clients_ov.gif"; 
  b7on= new Image;
  b7on.src="images/b_contact_ov.gif"; 
  b8on= new Image;
  b8on.src="images/b_software_ov.gif"; 
  b9on= new Image;
  b9on.src="images/b_argenti_ov.gif"; 
  b10on= new Image;
  b10on.src="images/b_club_ov.gif"; 
  b11on= new Image;
  b11on.src="images/b_store_ov.gif"; 
}
function turnon(imgName)
 {
   if (document.images)
    {
      imgOn = eval(imgName + "on.src");
      document[imgName].src = imgOn;
    }
 }

function turnoff(imgName)
 {
   if (document.images)
    {
      imgOff = eval(imgName + "off.src");
      document[imgName].src = imgOff;
    }
 }