// Copyright 2007 Google, Inc.
// This sample code is under the Apache2 license, see
// http://www.apache.org/licenses/LICENSE-2.0 for license details.

/**
 * @fileoverview Wrapper for Mouseover Tracking
 */

/**
 * @class Mouseover Tracker.
 *     This class provides basic logic to track the first mouseover on
 *     a given object. It is motivated by the fact that many mouseovers
 *     may occur on an object, and the first provides the most useful data
 *     whereas others may simply incur wasteful additional calls.
 *
 * @param {Object} tracker The GA tracker to use for mouseover tracking.
 * @param {String} opt_obj_name Optional object name for the event tracker,
 *     overriding the default which is "MouseoverTracker".
 * @constructor
 */
var MouseoverTracker = function(tracker, opt_obj_name) {
	if (typeof tracker == "undefined") { 
		throw new Error("Mouseover tracker constructor requires GA tracker object.");
	}
	this.tracker_ = tracker;
	this.tracked_ = false;
	if (opt_obj_name != undefined) {
		this.obj_name_ = opt_obj_name; 
	}
	else { 
		this.obj_name_ = 'MouseoverTracker'; 
	}
};
/**
 * Tracks the mouseover if it has not been tracked before.
 */
MouseoverTracker.prototype._trackMouseover = function() {
	if (!this.tracked_) {
		eventTracker = this.tracker_._createEventTracker(this.obj_name_);
		eventTracker._trackEvent('Mouseover');
		this.tracked_ = true;
	}
};
var mouseOverTracker = new MouseOverTracker(pageTracker);
document.getElementById("logo").onMouseOver = mouseOverTracker._trackMouseOver;