need help identifying a disco song -i only know some lyrics

[discodan]

i think this song came out in the 1978 to 1981 time period the lyrics go something like this " because tonight we're gonna party down, because tonight we're gonna have a good time, because tonight we're gonna dance all night ... c'mon you can do it" , if someone knows the name of the song or the artist that sings it please let me know at my email discodan60@aol.com or leave a message here,thanks to anyone that can help. the song is a fast disco song at first , then slows down in the middle of the song with some handclapping, then speeds up again and gets fast again.