My sheet is layed out like so:

A B
1 Jim 100
2 Dave 200
3 34
4 300
5 43
6 22
7 Steve 44
8 Jim 100
9 Dave 200
10 34
11 300
12 Al 43
13 22
14 Jim 44

I would like a function that would count the number of blank cells
underneath the selected cell until the next filled cell. For example if I
were to use this function on A2, it would return 4. On A9, it would return 2.
Is there any formula that would do this?
Thanks