Hi lei,
Thanks for adding that feature!
A few humble suggestions and observations on your website. The biz map module page http://www.zldnn.com/BusinessMap/BusinessMap/tabid/512/Default.aspx could use some more fleshed out examples, admin screen shots, maybe download the user's manual. Also, what about product forums?
Also on that page, if you notice in firefox your modules menu is 'under' the map image. This is a transparency issue that I have run into before. See this post which might help http://forums.asp.net/p/962489/1281899.aspx#1281899 - also datasprings forums have something on it.
And your website always is too wide - I think because you have too many header tabs across the top.
Thanks,
Will