how to switch to a new window

hi, I have written a script in selenium rc. I m facing one problem regarding new window selection.
my script issue is when I click on a button the page gets open in new firefox window for which I have written a verification code (i.e waitForCondition("element xpath")..) but my script fails here. iI think since it doesnt switch the window my script may be failing over here.so please help me how to switch window .I tried using selenium.selectWindow("windowtitle/windowname"), still it fails

Hello , 
this is a C# code that answer your question:

driver.Navigate().GoToUrl("Your URL");

String homePage = driver.CurrentWindowHandle;

//change the window then:

ReadOnlyCollection windows= driver.WindowHandles;
            
           
            String currentWindowId;
            foreach(String window in windows)
            {
                currentWindowId = window.ToString();
                if(currentWindowId.Equals(homePage))
                {
                    driver.SwitchTo().Window(currentWindowId);                 
                    
                }
            }

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this is best code for New Windows