How do I keep mouse input when the web page has focus?

When building a project with Unity 3.0, the mouse point now has to be directly over the 3D window in the web player to capture input. Before, with a 2.6 web player build, mouse input was active so long as the browser tab had focus.

Is there a way to set it back to the Unity 2.6 method or mitigate the effect?

** Actually, after some additional experimentation, I've released this is a problem with Chrome. IE, Firefox and Chrome are all acting slightly differently now. IE and Firefox don't have the problem I described above (but don't act exactly right either).