Fill roman number series

Hello, I need to make macro witch makes series of Roman numbers (Similar to built in excel series- fillseries.JPG )
So I made user-form and recorded built in "fill series" in macro and I'm trying to combine and modify them but I'm out of luck. I'm sure that this is maximum five minute job for experienced person, but I'm newbie to VBA and I'm really stuck.
Please help me.
P.S. Sorry for my bad English.

Cross-posted here

http://en.kioskea.net/forum/affich-5...r-series-macro

How I said - I'm noob. And that code don't bring me close to finishing.
So I maid user-form ehhhfills.JPG so maybe you could complete this one for me? I would appreciate it.