boolean isElementPresent(By by) {
        d1.manage().timeouts().implicitlyWait(0, TimeUnit.SECONDS);

        boolean val = true;
        System.out.println("start isElementPresent: " + time());
        if (d1.findElements(by).size() == 0) {
            val = false;
        }
        System.out.println("end isElementPresent(__ "+val+" __) " + time());
        System.out.println();
        d1.manage().timeouts().implicitlyWait(implicitlyWait, TimeUnit.SECONDS);
        return val;
    }