function toggle(which) 
{ 
   var el = document.getElementById(which); 
   el.style.display = (el.style.display == 'none') ? 'block' : 'none'; 
   return false; 
} 


function toggle_fic(which) 
{ 
   var el = document.getElementById(which); 
   el.style.display = (el.style.display == 'none') ? 'block' : 'none'; 

   var elImg = document.getElementById(which+"img"); 
   elImg.src = (el.style.display == 'none') ? 'img/close_arr.gif' : 'img/open_arr.gif'; 
   return false; 

}