guiText.text could this be word wrapping?

I do not know how to wrap this codes for the GUIText could any one please show me how? This code make my text typing from left to right but I need it wrapped so I could write more words for my game so please show me how? This code original from wiki.

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var letterPause = 0.2; var sound : AudioClip;

private var word;

function Start() { word = guiText.text; guiText.text = "" ; TypeText (); }

function TypeText () { for (var letter in word.ToCharArray()) {

    guiText.text += letter;
    if (sound)
        AudioSource.PlayClipAtPoint(sound, Camera.main.transform.position, .66);
    yield WaitForSeconds (letterPause);
}       

}