car is dead...new battery ect :( cant fig it out

[jprice]

alright well the other day i started noticing the car turning over slow so i replaced the battery and with the first turnover on it the car clicked and would not turn over but then eventually it started and was fine for like 2 days. then again it started turning over slow and now is dead in my garage...i got the alt. checked and it was fine but the car still wont start. just tried jump starting the car and it wont even do that....im thinking it could be the starter? when they keys are in the car, the radio works and all the windows go up and down fine but when i turn the key to start it it wont even click.... any suggestions?


thanks!