selenium-webdriver wait

wd.java

public WebElement waitFindElement(WebDriver drv, By by, long timeout, long interval)
{
    long start = System.currentTimeMillis();
    while(true){
	try{
	    return drv.findElement(by);
	} catch(NoSuchElementException nse) {
	    if(System.currentTimeMillis()-start>=timeout)
            {
	        throw new Error("Timeout reached and element["+by+"]not found");
	    }
	    else {
		try {
		    synchronized(this){
			wait(interval);
		    }
		} catch (InterruptedException e) {
		    e.printStackTrace();
		}
	    }
	}
    }
}