The site that was provided is an okay site for a beginner, but one thing it missed out was explaining what hiragana, katakana, and kanji are, which, Inuyasha-the-kid, you have a problem understanding. Sorry I don't have a site off the bat to help explain them, but I can try to explain it simple on my own:
romaji - Japanese written with roman alphabet (the abc's).
hiragana - Japanese characters used for Japanese words.
katakana - Japanese characters used for non-Japanese words, or sometimes to emphasize certain words (this is a different set from hiragana, but with a corresponding in pronunciation [ka, ki, ku, ke, ko, etc.]).
kanji - Chinese characters to represent Japanese words, often a combination with hiragana.
Keiichi