Automatic scrolling for dynamic textbox is too fast?

heloo to all
i’m creating a dynamic textbox that load from external data.I 'm using this code to make it automatic scrolling

articleData.load(“data.txt”);
article.text=articleData.externalvariable
_root.createEmptyMovieClip(“empty”, 1)
empty.onEnterFrame=function(){
article.scroll==article.maxscroll ?
article.scroll=1 :
article.scroll++;

}

but the scrolling is moving too fast !!! How i’m going to put a delay on it