var timerlen = 5;
var slideAniLen = 250;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var moving = new Array();
var dir = new Array();

function slidedown(objname)
{
  if (moving[objname])
    return;

  if (document.getElementById(objname).style.display != "none")
    return;

  moving[objname] = true;
  dir[objname] = "down";
  startslide(objname);
}

function slideup(objname)
{
  if (moving[objname])
    return;

  if (document.getElementById(objname).style.display == "none")
    return;

  moving[objname] = true;
  dir[objname] = "up";
  startslide(objname);
}

function opendown(objname)
{
  obj[objname] = document.getElementById(objname);
  obj[objname].style.display = "block";
  if (obj[objname].style.height == '')
  {
    var scrollheight = document.getElementById(objname).scrollHeight;
    scrollheight = document.getElementById(objname).scrollHeight;
    var height = (obj[objname].clientHeight > 0 ? obj[objname].clientHeight : scrollheight);
    obj[objname].style.height = parseInt(height) + "px";
  }
}

function startslide(objname)
{
  obj[objname] = document.getElementById(objname);

  if (obj[objname].style.height == '')
  {
    obj[objname].style.display = "block";
    var scrollheight = document.getElementById(objname).scrollHeight;
    scrollheight = document.getElementById(objname).scrollHeight;
    var height = (obj[objname].clientHeight > 0 ? obj[objname].clientHeight : scrollheight);
    endHeight[objname] = parseInt(height);
    obj[objname].style.display = "none";
  }
  else
    endHeight[objname] = parseInt(obj[objname].style.height);

  startTime[objname] = (new Date()).getTime();

  if (dir[objname] == "down")
  {
    obj[objname].style.height = "0px";
  }

  obj[objname].style.display = "block";

  timerID[objname] = setInterval('slidetick(\'' + objname + '\');',timerlen);
}

function slidetick(objname)
{
  var elapsed = (new Date()).getTime() - startTime[objname];

  if (elapsed > slideAniLen)
    endSlide(objname);
  else
  {
    var d = Math.round(elapsed / slideAniLen * endHeight[objname]);
    if (dir[objname] == "up")
      d = endHeight[objname] - d;
    obj[objname].style.height = d + "px";
  }

  return;
}

function endSlide(objname)
{
  clearInterval(timerID[objname]);

  if (dir[objname] == "up")
    obj[objname].style.display = "none";

  obj[objname].style.height = endHeight[objname] + "px";

  delete(moving[objname]);
  delete(timerID[objname]);
  delete(startTime[objname]);
  delete(endHeight[objname]);
  delete(obj[objname]);
  delete(dir[objname]);

  return;
}

function slide(objname)
{
  if(moving[objname])
    return;
  if(document.getElementById(objname).style.display == "none")
    slidedown(objname);
  else
    slideup(objname);
}