ASP.NET Popup Control
http://www.codeproject.com/aspnet/asppopup.asp?df=100&forumid=26153&exp=0&select=766157
Injecting Client-Side Script From An ASP.NET Server Control
http://www.webpronews.com/webdevelopment/webapplications/wpn-27-20040414InjectingClientSideScriptfromanASPNETServerControl.html