Validation of a tool tip

To validate the tooltipof below mentioned site:

https://www.google.com/adsense/g-app-single-1?hl=en&sourceid=aso&subid=ww-en-et-ads&medium=link

selenium.mouseOver(""//img[contains(@id,'tooltipImage')])
Thread.sleep(1000);
selenium.mouseOver("//div[contains(@class,tooltipPopup)]")
Thread.sleep(1000);
selenium.getText("//div[contains(@class,tooltipPopup)]/meta/a")