How to scroll up the invisible webpage to find out the elements using selenium webdriver?

Hi all,

I am facing the problem to find the elements which are in visible page part using selenium webdriver. Please could any body send me the code for that.

I am using Firefox browser here I could able to click on the visible elements (testboxes, listboxes...) but could not able to click on the in visible elements here my problem is how to scroll down the page to find out those elements.

Thanks,
Syam..

Pls provide more details like:
1. You mean to say that the webpage is not visible and you want to click an element there?
2. Which browser r u using?
3. Do you want to scroll up/down on the desired webpage?

If there's a scroll bar (for a long list of countries) in a webpage, how to scroll down?

I know it is supposed to work, but the following is not working:

Code:

((JavascriptExecutor)driver).executeScript("window.scrollBy(x,y)");   
// insert value for x and y