empty field in field group

Hey,

If i make field group that contains a start and ending date it is impossible to leave one date field empty.

So one repeatble group
date_start and date_stop
1) date and date
2) date and empty

when i output this the 2e date_stop field takes the value of the first date_stop.
I think it has something to do with the fact that i cant delete dates once they are inputted.

any ideas?

B.

http://wordpress.org/plugins/simple-fields/