// 共通関数      
function domlevel()
{ 
  // IE4 = 1, IE5+ = 2, NN4 = 3, NN6+ = 4, others = 0
  return( document.all?(document.getElementById?2:1):(document.getElementById?4:(document.layers?3:0)) ); 
}
function getid (id)
{ 
  return(document.getElementById(id)); 
}
// functions
function custom_onclick( id1, id2 )
{
  if ( getid(id1) != null )
    window.setTimeout( 'getid(\'' + id1 + '\').disabled=true;', 0 );

  if ( getid(id2) != null )
    window.setTimeout( 'getid(\'' + id2 + '\').disabled=true;', 0 );
}

// Forum Open/Close
function forum_viewer(id)
{
  var e_img;
  var e_tr;
  var p_display;
  
  e_img = getid("img-"+id);
  e_tr =  getid("trc-"+id);
  p_display = e_tr.style.display;

  if ( p_display != "none" && p_display != "" )
  {
    e_tr.style.display = "none";
    e_img.src = "../images/plus.gif";
  }
  else
  {
    e_tr.style.display = "block";
    e_img.src = "../images/minus.gif";
  }
}