function toggleMe(a,max_num)
{
  //first hide all other blocks
  for(i=1;i<=max_num;i++)
  {
	var other_e = eval("document.getElementById('para_" + i + "');");
	other_e.style.display = 'none';
  }

  var e = document.getElementById(a);
  if(!e)return true;
  if(e.style.display=="none")
  {
    e.style.display="block"
  }
  else
 {
    e.style.display="none"
  }
  return true;
}