// Help tips
// Richard Livsey
// http://livsey.org/2005/3/17/help-tips-experiment

// Slightly modified to work with XHTML doctypes

function getElementsByTagNames(tagNames){
	var elements = new Array();
  for (i = 0,k = 0; i < tagNames.length; i++)
  {
  	var tagName = tagNames[i];
  	var tmp = document.getElementsByTagName(tagName);
	  for (j = 0; j < tmp.length; j++)
		{
			elements[k++] = tmp[j];
		}
  }

  return elements;
}
document.getElementsByClassName = function (needle)
{
  //var         my_array = document.getElementsByTagName("*");
  var         my_array = getElementsByTagNames(new Array('a','img','input'));
  var         retvalue = new Array();
  var        i;
  var        j;

  for (i = 0, j = 0; i < my_array.length; i++)
  {
    var c = " " + my_array[i].className + " ";
    if (c.indexOf(" " + needle + " ") != -1)
      retvalue[j++] = my_array[i];
  }
  return retvalue;
}

function addEvent(obj, evType, fn)
{
	if (obj.addEventListener)
	{
		obj.addEventListener(evType, fn, false);
		return true;
	}
	else if (obj.attachEvent)
	{
		var r = obj.attachEvent("on"+evType, fn);
		return r;
	}
	else
	{
		return false;
	}
}

function HelpHover()
{
	this._mousePosX = 0;
	this._mousePosY = 0;
	this._hoverItem = null;
	this._hoverContents = null;
}

HelpHover.prototype.init = function()
{
	var hh = this;
	var helpItems = document.getElementsByClassName('helpIcon');
	for (var i=0; i<helpItems.length; i++)
	{
		helpItems[i].onmousemove = function(e)
		{
			if (!e) var e = window.event;
			if (e.pageX || e.pageY)
			{
				hh.mousePosX = e.pageX;
				hh.mousePosY = e.pageY;
			}
			else if (e.clientX || e.clientY)
			{
			    // for xhtml doctypes
			    if (document.documentElement)
			    {
				    hh.mousePosX = e.clientX + document.documentElement.scrollLeft;
				    hh.mousePosY = e.clientY + document.documentElement.scrollTop;
				}
				else
				{
				    hh.mousePosX = e.clientX + document.body.scrollLeft;
				    hh.mousePosY = e.clientY + document.body.scrollTop;				
				}
			}
			hh._hoverItem = this;
			hh._hoverContents = document.getElementById(this.id+'Tip');
			hh.move();
		}
		helpItems[i].onmouseout = function (e)
		{
			hh.out();
		}
	}
}

HelpHover.prototype.out = function()
{
	this._hoverContents.style.top = -10000+'px';
	this._hoverContents.style.left = -10000+'px';
	this._hoverItem = null;
	this._hoverContents = null;
}

HelpHover.prototype.move = function()
{
	this._hoverContents.style.top = this.mousePosY+10+'px';
	this._hoverContents.style.left = this.mousePosX+10+'px';
}

addEvent(window, 'load', function()
{
	var hh = new HelpHover();
	hh.init();
});