Notes/Domino 4 and 5 Forum

Hi All
In my document library DB i need to display documents in a view with a number eg: 1, 1.1, 1.2,.......1.10,1.11 ect....
for that i created a field(computed) with 4 decimal places in it....now the problem is after 1st document 1.1 should be displayed(it should not display 1.1000) and after 1.9, it should be 1.10 ...likewise after 1.99, 1.100 should be displayed....plese help me to solve this problem
Regards
Shana