I have a page with various bits of information displayed from a database. When a user clicks on one of the pieces of data, I'd like to display a box allowing them to select a new value for that field, with an effect similar to a pop-up window, without actually popping up a new window. How would I go about graying out the existing page (semi-transparently) and displaying a box with new value choices in it, and then removing the grayed out effect after the 'popup' layer closes?
If someone has sample code that would be most useful, but any tips would be great.
Using VS 2008, C#, ASP.NET.