Haven't you asked this before? Anyways.. check around your clutch pedal and you should be able to see the rod that goes through the firewall.. If there's fluid there, you need to rebuild your master cylinder (I just did that today and it cost me in total 12 bux (7 for kit, 5 for brake fluid). Or check if there's leaks in the lines. Then lastly, check your clutch slave cylinder (lift up the back rubber) and check if there's a leak. If so, then rebuild that too =D.
It doesn't take more than 1 hour to do everything. Hope that helps.
-derek