you're on the right track.. the O (orientation) says if it's Vertical or Horizontal..
H2 is the Height/Width of the pointer (depends on if vertical or horizontal)
The Style is what actually is the background images you're trying to use..
This is all explained in skin commands.txt (please check it out).. in any case you need to define the path to your background images before you define your slider (so RR knows which "style" to use):
Then on your slider definition, you use the style number defined above "01" and those are a the background images to be used with the slider. The Y definition must be BEFORE the S definition of the slider.