/*  Your are permitted to reuse this code as long as the following copyright
    notice is not removed:

    The HTML tip handling code is copyright 1998 by insideDHTML.com, LLC. More information about this
    code can be found at Inside Dynamic HTML: HTTP://www.insideDHTML.com
*/

// Support for all collection
var allSupport = document.all!=null

function setupEventObject(e) {
  // Map NS event object to IEs
  if (e==null) return // IE returns
  window.event = e
  window.event.fromElement = e.target
  window.event.toElement = e.target
  window.event.srcElement = e.target
  window.event.x = e.x
  window.event.y = e.y
  // Route the event to the original element
  // Necessary to make sure _tip is set.
  window.event.srcElement.handleEvent(e);
}


function checkName(src) {
  // Look for tooltip in IE
  while ((src!=null) && (src._tip==null))
    src = src.parentElement
  return src
}

function getElement(elName) {
  // Get an element from its ID
  if (allSupport)
    return document.all[elName]
  else
    return document.layers[elName]
}

function writeContents(el, tip) {
  // Replace the contents of the tooltip
  if (allSupport)
    el.innerHTML = tip
  else {
    // In NS, insert a table to work around
    // stylesheet rendering bug.
    // NS fails to apply style sheets when writing
    // contents into a positioned element.
    el.document.open()
    el.document.write("<TABLE WIDTH=200 BORDER=0><TR><TD WIDTH=100% BGCOLOR=#FFFFCC>")
    el.document.write(tip)
    el.document.write("</TD></TR></TABLE>")
    el.document.close()
  }
}

function getOffset(el, which) {
  // Function for IE to calculate position 
  // of an element.
  var amount = el["offset"+which] 
  if (which=="Top")
    amount+=el.offsetHeight
  el = el.offsetParent
  while (el!=null) {
    amount+=el["offset"+which]
    el = el.offsetParent
  }
  return amount
}


function setPosition(el) {
  // Set the position of an element
  src = window.event.srcElement
  if (allSupport) {
    el.style.pixelTop = getOffset(src, "Top")
    el.style.pixelLeft = getOffset(src, "Left")
  } else
  {
    el.top = src.y + 20 
    el.left = src.x 
  }
}

function setVisibility(el, bDisplay) {
  // Hide or show to tip
  if (bDisplay)
    if (allSupport)
      el.style.visibility = "visible" 
    else
      el.visibility = "show";
  else
    if (allSupport)
      el.style.visibility = "hidden"
    else
      el.visibility = "hidden"
}


function displayContents(tip) {
  // Display the tooltip. 
  var el = getElement("tipBox")
  writeContents(el, tip)
  setPosition(el)
  setVisibility(el, true)
}


function doMouseOver(e) {
  // Mouse moves over an element
  setupEventObject(e)
  var el, tip
  if ((el = checkName(window.event.srcElement))!=null)
    if  (!el._display) {
      displayContents(el._tip)
      el._display = true
    }
}

function doMouseOut(e) {
  // Mouse leaves an element
  setupEventObject(e)
  el = checkName(window.event.srcElement)
  var el, tip
  if ((el = checkName(window.event.srcElement))!=null)
    if (el._display)
      if ((el.contains==null) || (!el.contains(window.event.toElement))) {
	setVisibility(getElement("tipBox"), false)
	el._display = false
      }
}

function doLoad() {
  // Do Loading
  if ((window.document.captureEvents==null) && (!allSupport))
    return // Not IE4 or NS4
  if (window.document.captureEvents!=null)  // NS - capture events
    window.document.captureEvents(Event.MOUSEOVER | Event.MOUSEOUT)
  window.document.onmouseover = doMouseOver;
  window.document.onmouseout = doMouseOut;
}

window.onload = doLoad