Several researches have been carried out in recent years for developing Human Computer Interface (HCI). Human Computer Interface as an assistive technology helps the people with motor disabilities and who can't move their arms. Eye tracking techniques can be used for the communication of these people. In this paper, image based eye tracking technique is used for interaction. The aim of this paper is to help the disabled people to use the computer efficiently. It is based on controlling cursor movements on the screen using only the eyes. The system proposed in this paper uses a low resolution Webcam which is attached to a wearable glass frame, for eye tracking. The images obtained from the webcam are processed to locate the iris center. This is used to estimate the eye gaze. The cursor is moved in the desired direction on the screen based on the estimated eye gaze. The selection of the tabs is also carried out by blinking. The proposed system shows good performance in good lighting conditions.