diff --git a/lib/chrome.js b/lib/chrome.js
index 8a656d3..3be1448 100644
--- a/lib/chrome.js
+++ b/lib/chrome.js
@@ -291,6 +291,10 @@ var ChromeObject = function() {
 			"url": url
 		});
 	};
+	
+	this.navigateEvaluately = function(url) {
+		return this.evaluate('location.href = "' + url + '"');
+	};
 
 	this.evaluate = function(expression) {
 		try {
@@ -302,6 +306,15 @@ var ChromeObject = function() {
 		}
 	};
 
+	this.getEvaluatedValue = function(expression) {
+		try {
+			var response = this.evaluate(expression);
+			return JSON.parse(response).result.result.value;
+		} catch (e) {
+			console.error("ChromeObject.getEvaluatedValue() -> " + e.message);
+		}
+	};
+
 	this.close = function() {
 		return this.sendPageRPC("Browser.close", {});
 	};
@@ -314,6 +327,23 @@ var ChromeObject = function() {
 	};
 
 	this.focus = function() {
+		if (this.debuggingPort > 0) {
+			try {
+				// get current title
+				var _title = this.getTitle();
+
+				// implementation of focus()
+				this._focus();
+
+				// change webpage title to original
+				this.setTitle(_title);
+			} catch (e) {
+				console.error("ChromeObject.focus() -> " + e.message);
+			}
+		}
+	};
+	
+	this._focus = function() {
 		if (this.debuggingPort > 0) {
 			try {
 				// if page ID is empty
@@ -329,10 +359,8 @@ var ChromeObject = function() {
 
 				// find window by title
 				var pageList = this.getPageList();
-				for (var i = 0; i < pageList.length; i++) {
-					if (pageList[i].id == this.pageId) {
-						this.oAutoIt.WinActivate(pageList[i].title);
-					}
+				if (pageList.length > 0) {
+					this.oAutoIt.WinActivate(this.pageId);
 				}
 			} catch (e) {
 				console.error("ChromeObject.focus() -> " + e.message);
@@ -412,14 +440,12 @@ var ChromeObject = function() {
 
 	this.getTitle = function() {
 		if (this.debuggingPort > 0) {
-			var response = this.evaluate('document.title');
-			return JSON.parse(response).result.result.value;
+			return this.getEvaluatedValue('document.title');
 		}
 	};
 
 	this.getScreenPosition = function() {
-		var response = this.evaluate('(function() { return [window.screenX, window.screenY].join(","); })();');
-		var result = JSON.parse(response).result.result.value;
+		var result = this.getEvaluatedValue('(function() { return [window.screenX, window.screenY].join(","); })();');
 		var pos = result.split(',');
 		return {
 			"x": parseInt(pos[0]),
@@ -431,8 +457,7 @@ var ChromeObject = function() {
 		var height = 0;
 
 		if (this.debuggingPort > 0) {
-			var response = this.evaluate('(function(obj) { return Math.max(obj.scrollHeight, obj.clientHeight); })(document.querySelector("html"))');
-			var result = JSON.parse(response).result.result.value;
+			var result = this.getEvaluatedValue('(function(obj) { return Math.max(obj.scrollHeight, obj.clientHeight); })(document.querySelector("html"))');
 			height = parseInt(result);
 		}
 
@@ -467,7 +492,7 @@ var ChromeObject = function() {
 		var page = this.getPageById(this.pageId);
 		return page.url;
 	};
-	
+
 	this.triggerEvent = function(eventName, selector) {
 		return this.evaluate('document.querySelector("' + selector + '").dispatchEvent(new Event("' + eventName + '"))');
 	};
@@ -481,6 +506,12 @@ var ChromeObject = function() {
 	this.reload = function() {
 		return this.sendPageRPC("Page.reload", {});
 	};
+	
+	this.hasClass = function(selector, className) {
+		var result = this.getEvaluatedValue('document.querySelector(".html5-video-player").getAttribute("class")');
+		var classNames = result.split(' ');
+		return (classNames.indexOf(className) > -1);
+	};
 
 	this.create();
 };
@@ -507,3 +538,7 @@ exports.startWithDebugging = function(url, proxy, profileName, debuggingPort) {
 		.open(url)
 	;
 };
+
+exports.VERSIONINFO = "Chrome Web Browser Debugging Interface (chrome.js) version 0.1";
+exports.global = global;
+exports.require = global.require;