function dispHandle( whichLayer )
{
  var elem, vis;
  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( whichLayer );
  else if( document.all ) // this is the way old msie versions work
    elem = document.all[whichLayer];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers[whichLayer];
  vis = elem.style;
  // if the style.display value is blank we try to figure it out here
  if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
    vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
  vis.display = (vis.display==''||vis.display=='block')?'none':'block';
}

function xstooltip_findPosX(obj)
{
  var curleft = 0;
  if (obj.offsetParent)
  {
    while (obj.offsetParent)
        {
            curleft += obj.offsetLeft
            obj = obj.offsetParent;
        }
    }
    else if (obj.x)
        curleft += obj.x;
    return curleft;
}

function xstooltip_findPosY(obj)
{
    var curtop = 0;
    if (obj.offsetParent)
    {
        while (obj.offsetParent)
        {
            curtop += obj.offsetTop
            obj = obj.offsetParent;
        }
    }
    else if (obj.y)
        curtop += obj.y;
    return curtop;
}

function xstooltip_show(tooltipId, parentId, posX, posY)
{
    it = document.getElementById(tooltipId);

    if ((it.style.top == '' || it.style.top == 0)
        && (it.style.left == '' || it.style.left == 0))
    {
        // need to fixate default size (MSIE problem)
        it.style.width = it.offsetWidth + 'px';
        it.style.height = it.offsetHeight + 'px';

        img = document.getElementById(parentId);

        // if tooltip is too wide, shift left to be within parent
        if (posX + it.offsetWidth > img.offsetWidth) posX = img.offsetWidth - it.offsetWidth;
        if (posX < 0 ) posX = 0;

        x = xstooltip_findPosX(img) + posX;
        y = xstooltip_findPosY(img) + posY;

        it.style.top = y + 'px';
        it.style.left = x + 'px';
    }

    it.style.visibility = 'visible';
}

function xstooltip_hide(id)
{
    it = document.getElementById(id);
    it.style.visibility = 'hidden';
}