// preload images 
function loadsign()
{
  if (document.images) {
    plus_on = new Image (); 
    plus_on.src = 'img/commun/minus.gif'; 
    plus_off = new Image (); 
    plus_off.src = 'img/commun/plus.gif';
    }
}

function ShowHide(divId, iCounter)
{
   var thisid = document.getElementById(divId+iCounter);    
   if (document.images) {
     if (thisid.style.display == "none")
       {
       eval("thisid.style.display = 'block';");     
       document.images["sID"+iCounter].src = eval('plus_on.src');
       }
     else
       {
       eval("thisid.style.display = 'none';");
       document.images["sID"+iCounter].src = eval('plus_off.src'); 
       }
     }
}