HELP! my clutch is sticking it comes up all the way but is very loose after about 1/3 of the way.. this has started to happen ever since it got cold...

I was reading the archives.. and noticed some stuff about the master and slave cylinder.. I'm not exactly sure what they are.. i see 2 thigns i think it is.. but i can't be sure.. the big one has fluid in it.. the smaller one looks like it has a thing inside that's closing the top.. and I can't tell if there is liquid in there..

my car is an EG /w GSR motor..

Thanks