Hi there,
If SDS PAGE sounds like a ridiculous combination of letters, you urgently need to decipher what these letter mean and understand the mechanism of this technique.
Firstly, watch the video.
Then flick through the notes.
http://web.mnstate.edu/provost/BiochemistryLabI.html
http://en.wikipedia.org/wiki/Polyacrylamide_gel_electrophoresis
A good tutorial about gel electrophoresis can be found HERE.