Problem & questions about terrain textures

Hello! I'm new to these forums and skinning.
I'm working on a terrain skin project but need some help with it.

1. Can I, and how can i change the color of the water in a tileset? I tried to import new TerrainArt\Water.slk but it doesn' seem to work.
::EDIT:: Ok, found it, thanks WindRunner!

2. masks: where two tiles meet in a map, the one upper in the hierarchy has some border-tiles to make a transition between the two tiles. fe: [dirt][dirt with some grass][grass]. As i got to know, these border-tiles are stored in the .blp file of the upper tile (in this gase grass). But they are masked out from 64*64 image-parts of the blp(found these parts), and in the .blp it is not very easy to find, where does the visible-in-the-game-part end. How can i edit or view these masks?
::EDIT:: Ok, found it in the tutorial forums.


::EDIT:: STILL GREAT PROBLEMOS:

3. cliffs: the worldeditor's "modify tileset" part does not allow to change cliff tiles. With replacing these tiles' .blp images though you can change them. But the problem is that the cliff doesn't change with it. (I made some funny parts this way ;) ) With BLPextractorII i found the directory ReplaceableTextures\Cliffs in war3.mpq and tried to change the .blps found there (yes, i have read the tutorials on this site about importing skins in TFT and it worked in most cases) but these changes had no effect on the maps i created: still funny-looking cliffs. How can i edit these cliff-skins?

4. expansion-only cliffs: i can't find the .blps for the expansion-only terrain-cliffs, there is no \Cliffs directory in war3x.mpq, but i need to find the cliff-skins for outland and black citadel tilesets. Where????

Thanks for your help!

OK, found answer to Q2, masks are in the alpha channel right? oh, how nice is this world! you learn new things every day! ^_^

no need to make a skin for water, in the WE you can change the color.

EDIT: and we have a nice edit button, so dont double post and edit you post, like i just did.