public static WebDriver getInstance(String browserName){
		if (browserName == null) {
			driver = new FirefoxDriver();
		}
		else if (browserName.equals("chrome")) {
			System.setProperty("webdriver.chrome.driver", "C:\\Users\\Yura\\Documents\\chromedriver.exe");
			driver = new ChromeDriver();
		}
		else if (browserName.equals("firefox")) {
			driver = new FirefoxDriver();
		}
		return driver;
	}