By running banner I assume you mean scrolling text? This can be done (I don't recall is this is a built in LCD function) but you can program this to scroll over. Basically you would load you text you want to scroll and start adding the letters one at a time while shifting the position to the left dragging the later with it.
a word : any characteres ? or a word = an integer value ?
so, Now you have some the tools to do it...
Try and at First ,to Display a fixe message on LCD, and if successfull
try to shift the msg on display. and show us some personnal work ...