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('helpLocation');

	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() {
	this._hoverContents.style.top = this.mousePosY+20+'px';
	this._hoverContents.style.left = this.mousePosX-300+'px';
}

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