Thank you guys, for the fast and great anwsers, it worked like a charm.
Just one question, i got 2x sliding potentiometers to test it, theyre both 125k, and well.. The start is 0%, the end is 100%, and value equal to 50% is not really at the middle of the potentiometer... It like 25% to the top... Do i need some other resistance for 50% value be located at the middle? If yes, that what resistance sould it be?