Not able to handle popup

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Hi,

I am writing the following code but it is not able to handle popups.Kindly help.

selenium.SetTimeout("3000000");
selenium.Open("/");
selenium.Click("link=Donation Boost");
selenium.Click("link=Read more");
http://selenium.WaitForPageToLoad("30000");
// selenium.Click("link=Read more");
// selenium.WaitForPageToLoad("30000");
http://selenium.Click("errorTryAgain");
http://selenium.WaitForPageToLoad("30000");
selenium.Click("//input[@value='Sign up']");
selenium.WaitForPopUp("popupwindow", "30000000");
selenium.Click("//input[@value='Sign up']");
selenium.SelectWindow("name=popupwindow");
selenium.Type("email", "[email=r@g.com]r@g.com[/email]");
selenium.Click("//input[@value='Complete Subscription Request']");
selenium.WaitForPageToLoad("3000000");
selenium.SelectWindow("null");
selenium.Click("link=Disqus");
selenium.Click("dsq-post-button");
selenium.SelectFrame("easyXDM_default201_provider");
selenium.Type("document.forms[0].elements[0]", "");
selenium.SelectFrame("relative=up");
selenium.Click("dsq-post-button");
selenium.Select("dsq-sort-select", "label=Best rating");
selenium.Click("link=Subscribe by RSS");
selenium.WaitForPageToLoad("30000000");
selenium.Click("LOCATOR_DETECTION_FAILED");
selenium.Click("alwaysUse");
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