Battlefield II Camera Movement Issue

For some reason, whenever I play Battlefield II, my cursor never disappears from the screen (even during gameplay), and my character's camera movement is limited to how much my mouse can move; if my cursor reaches the edge of my screen, my camera is unable to move any further. This is a big problem for me, since it limits my ability to do so much as look around while I play, and the only way to get around it is by pausing my game, moving my mouse back to a position where it can move in the direction I want it to, and then resuming the game afterward. Not just that, but having my cursor on-screen the whole time is getting really annoying. Can someone help me please?