How to handle popup or alert messages using selenium web driver

How to handle popup or alert messages using selenium web driver

import org.openqa.selenium.Alert;

import org.openqa.selenium.By;

import org.openqa.selenium.WebDriver;

import org.openqa.selenium.firefox.FirefoxDriver;

public class webbb {

            /**

             * @param args

             */

            public static void main(String[] args) {

                        WebDriver wd=new FirefoxDriver();

                       

                       

                       

                        wd.get("http://mypage.rediff.com/login");

                        wd.findElement(By.xpath(".//*[@id='toprightinfo']/a[1]")).click();

                       

                        wd.findElement(By.xpath(".//*[@id='c_uname']")).click();

                       

                        wd.findElement(By.xpath(".//*[@id='btn_login']")).click();

                        Alert abox =wd.switchTo().alert();

                        abox .accept();

                        //abox.dismiss();

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