Drag and Drop is not working in my selenium code below, can anyone help me?
package selenium;
import java.util.concurrent.TimeUnit;
import org.apache.log4j.BasicConfigurator;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.interactions.Actions;
import org.openqa.selenium.WebElement;
public class draganddrop {
    public static void main(String[] args){
        BasicConfigurator.configure();
        FirefoxDriver driver=new FirefoxDriver();
        driver.get("http://jqueryui.com/droppable/");
        driver.manage().timeouts().implicitlyWait(3,TimeUnit.SECONDS);
        WebElement  from= driver.findElementByXPath("html/body/div[1]");
        WebElement  to=driver.findElementByXPath("html/body/div[2]");
        new Actions(driver).dragAndDrop(from, to).build().perform();
        //Actions mouseoveron=new Actions(driver);
        //mouseoveron.click().dragAndDrop(from, to).build().perform();
    }
}