If you miss Naurto episodes..Which are WAY behind. Go to Watch Anime Online - Anime Videos, Anime Series, Anime Episodes

They have all the Naruto Episodes. Just type in "Naruto Episode" then some number in the search box and a list will come up. The big fight between him and Sasuke is around Episode 120. Thats the first one where Sasuke goes full demon and Naruto unleashes one of the nine tails of the fox. Then after about 260 episodes, they have Naruto Shippuden, which is a few years after the fight with Sasuke.

They also have almost all of the major Anime series there too. Like Bleach...