Selenium 2 wait until AJAX done in JAVA

I using Selenium 2 and Java 1.7. I want to wait my HtmlUnitDriver until ajax done when i clicked filter button.

My driver:

Webdriver driver = new HtmlUnitDriver(true);

Filter button and click action:

WebElement weFilterButton = driver.findElement(By.name("filterButton"));
weFilterButton.click();

I tried three ways for wait AJAX done.

first:

WebElement el = wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("ctl00_ContentPlaceHolder1_Reports1_ajaxloadingImage"))); 

second:

Boolean el = wait.until(new ExpectedCondition<Boolean>() {
            public Boolean apply(WebDriver driver) {
                JavascriptExecutor js = (JavascriptExecutor) driver;
                return (Boolean) js.executeScript("return document.readyState").toString().equals("complete");
            }
        });

and although it is not a good solution

driver.manage().timeouts().pageLoadTimeout(10, TimeUnit.SECONDS);

but is not work.

EDIT

Selenium dependency is :

<dependency>
     <groupId>org.seleniumhq.selenium</groupId>
     <artifactId>selenium-java</artifactId>
     <version>2.45.0</version>
</dependency>