All borders in options are dark gray (instead of lite/dark gray mix)

See snapshots below for details.
![gray](https://f.cloud.github.com/assets/5421954/1415260/01e453cc-3eef-11e3-965c-a643737bcace.png)
![is](https://f.cloud.github.com/assets/5421954/1415261/06951ba4-3eef-11e3-9d0b-b9d3b1e92d19.png)


Additionally, comparison function was a little bit simplified.

Update: scrollbar color modified in separate PR.