How do I link to the App Store reviews for an application on the iPad?

I want to put a "rate/review this app" feature into my iPad app. As described in this similar question, I can use code like the following:

开发者_C百科[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?id=449581298&onlyLatestVersion=true&pageNumber=0&sortOrdering=1&type=Purple+Software"]];

to open the App Store to the appropriate section on iPhone.

However, this method does not work on the iPad. Is there a means of doing the same thing that still functions on the iPad?

This is the method I have used on my app, which is out for all iOS devices. We have an iPad 2 that we use for testing, works great. Perhaps it is a bug? Have you tried upgrading the iOS?