Bummer, but more details are necessary for your fellow users here to have a chance offer any useful help. For starters:
What version of Skype do you have installed? Click on Help > About Skype for the specific version number.
Are you on a Skype-to-Skype call or calling a phone number?
What webcam or mic do you have?
Please note: I do not respond to requests for help via Private Message.
i hav samsung galaxy s captivate