document.getElementsByClassName = function (needle)
{
  var         my_array = document.getElementsByTagName("*");
  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, true);
		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('hasHelp');
	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)
			{
				hh.mousePosX = e.clientX + document.body.scrollLeft;
				hh.mousePosY = e.clientY + document.body.scrollTop;
			}
			hh._hoverItem = this;
			hh._hoverContents = document.getElementById(this.id+'Help');
			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()
{
	var width = 800;
	var height = 600;

	if (parseInt(navigator.appVersion)>3) {
	 if (navigator.appName=="Netscape") {
	  width = window.innerWidth;
	  height = window.innerHeight;
	 }
	 if (navigator.appName.indexOf("Microsoft")!=-1) {
	  width = document.body.offsetWidth;
	  height = document.body.offsetHeight;
	 }
	}

	var boxHeight = 200;
	var boxWidth = 200;

	if(this._hoverContents != null && this._hoverContents.offsetHeight - 0 > 0)
	{
		boxHeight = this._hoverContents.offsetHeight + 25;
	}
	if(this._hoverContents != null && this._hoverContents.offsetWidth - 0 > 0)
	{
		boxWidth = this._hoverContents.offsetWidth + 25;
	}
	
	if(this.mousePosY + boxHeight > height)
	{
		this._hoverContents.style.top = this.mousePosY-16-boxHeight+'px';
	}
	else
	{
		this._hoverContents.style.top = this.mousePosY+24+'px';
	}

	//Prevent the deal from going off the side	
	if(this.mousePosX + boxWidth > width)
	{
		//Put the box to the left
		this._hoverContents.style.left = this.mousePosX-boxWidth+'px';
	}
	else 
	{
		//Put the box to the right
		this._hoverContents.style.left = this.mousePosX+'px';
	}
}

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