//
// http://www.texsoft.it/index.php?c=software&%20m=sw.js.htmltooltip&l=it
//

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'; 
}