How to get tool tip text on Images using selenium

package All_Types_Run;

import java.util.List;
import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.
WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;

public class Tooltip_On_Images {
    public static void main(String[] args) {
        WebDriver driver = new FirefoxDriver();
        driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
        driver.get("http://www.swissoutpost.com/");
        List<WebElement> imgs = driver.findElements(By.tagName("img"));
        System.out.println(imgs.size());
        int num =0;
        String toolTip="";
        for(int i=0; i<imgs.size(); i++){
            toolTip = imgs.get(i).getAttribute("title");
            num+=1;
            if(toolTip.equals("")){
            }else{
                System.out.println(toolTip);
            }
        }
        System.out.println(num);
    }
}