First, you must use dat window to install Subclipse 1.6 or so. Then window -> Show view -> Other -> SVN -> SVN Repository
Just watch this, it's kinda long, but meh.. Trance was lazy to edit it :D
http://www.youtube.com/watch?v=3gQ2yYH-F1Q&feature=player_embedded#t=0
or take a look here, it's kinda similar
http://www.l2jserver.com/wiki/Setup_Eclipse_and_SVN