function toggleShow(divName)
{
   var div = document.getElementById(divName);
   var minus = document.getElementById(divName+'Minus');
   if(div.style.display=='none')
   {
      div.style.display='block';
      minus.innerHTML='-';
   }
   else
   {
      div.style.display='none';
      minus.innerHTML='+';
   }
}