Sorry Microsoft (NASDAQ: MSFT). I know your Silverlight technology is bright and shiny. But I am on my office network and you know, "not supposed" to install anything unless thoroughly tested and approved. I bet you have a similar policy on your desktops too, where "the developers" will be "frowned upon" if they install unauthorized software, say (*gasp*) Thunderbird to read their (*gasp*^2) Gmails or (*gasp*^3) Firefox!
So please let me know if you have any brighter and shinier button which kills these "Install Silverlight" "Install Silverlight" windows once and for all till my IT department decides otherwise. You know, some might even call it a "popup window". Heh. Their nerves.