First of all, thanks for the help. And forgive me for my messed up english. I wanted to sort the array with respect to the "number" before the first dot, not the first digit, of course. Anyway, it turned out to be a matter of using ST really, and i noticed that implementing an ST by myself is beyond my programming skills for now. However, when i used the code shmem proposed, it worked. Thanks to all of you for your time.
I hope the OP (at least its topic) will be useful for future googlers, who are seeking for a solution for this particular, ehm, matter.