Kakumei: Thanks for the reply.
In order to set the transparency in the skin, extract the skins file (it's only a zip really) and you'll find a "regions.txt" in it. That is the file that contains edge information of the windows. You may set it up well, and may take credit for it. Heck, if you want you may even steal the whole skin, I don't really care, cuz I've did it for myself primarily. Even though if you want to set transparent edges for the playlist or the library or whatever, I think you'll have a hard time, cuz those windows (as they are resizeable) to my knowledge CAN'T have anything like that... Anyway, have fun experimenting and good luck!
Kailynn: thank you very much for your reply, aaand... D'know, maybe if many peeps like those skins I may sit down and make a BSPlayer skin maybe or something... But I'm very full of other works for school, so... Later

Thanks again!