function change_option(number,index)
{
  for(var j=1;j<= number;j++)
  {
  	  if(document.getElementById("sub_"+j).style.display=="block")
	  {
	  document.getElementById("sub_"+j).style.display ="none";
	  }
	  document.getElementById("sub_"+index).style.display ="block";
  }
}

function hiddensub(number,index)
{
  for (var i = 1; i <= number; i++) 
  {
    if(document.getElementById("tit"+i).className =="tit_b")
	{
      document.getElementById("tit"+i).className = "";}
      document.getElementById("tit"+index).className = "";
  }
  
  for(var j=1;j<= number;j++)
  {
  	  if(document.getElementById("sub_"+j).style.display=="block")
	  {
	  document.getElementById("sub_"+j).style.display ="none";
	  }
	  document.getElementById("sub_"+index).style.display ="none";
	  //document.getElementById("sub_"+1).style.display ="block";
  }
}