many to many relationship

hi all,
how to implement the many to many relation ship...
i get stucked it......
plz help
thanx
sajjadhere's a good example -- http://www.dbforums.com/t1094761.html|||thanx for reply man
can u explain the briefly background theory of Many to Many relation ship|||http://www.utexas.edu/its/windows/database/datamodeling/rm/rm4.html