I think you mean:
窶堙??堋、窶堙?ツ。窶堋?窶堙遺?堋ス 窶堙 窶堙絶?堙ァ窶堋ェ窶堙 窶堙 窶堋ゥ窶堋ォ窶堙懌?堋オ窶堋ス 窶堋ゥ窶堙ァ 窶堙??堋キツ。
Possible transliteration: Doumo. Anata ha hiragana de kakimashita kara desu.
Spoken as: "Doomo. Anata wa hiragana de kakimashita kara desu."
Translation: Thanks. Because you wrote using hiragana.
As for kanji lookup, there are many different online dictionaries that you can use. I use
Moji, which is a plug-in for the Mozilla Firefox browser. There's a link to it in my signature.