I would just like to thank both quizmonster and einstein for their replies. The link i was given by quizmonster was helpful but it wasnt quite what i was looking for and einstein gave me some very useful advice, thank-you! By the way it was for university, cheers!!
To Comloulou, Ive tried that but i cant seem to get a simple answer of them!! Its very frustrating when even the seminar tutors and lecturers cant give an easy example to understand, they all say something slightly different to one another!! Thanx anyway