OK, so you know how the scroll works. Now let's get that scroll to show up in a text box. Below is the altered code. I have underlined new commands to the script.
var space = "                  "
var ScrollText = space + "Hey hey! Look at me scrollin..."
Through your powers of deduction, you've probably noticed that these are HTML Form tags. Now that we're going into a text box format, a few things become important. First off, you have to make sure that you assign the form itself and the text box a name. I have named the form itself "TheForm" and the text box "display". I think those are pretty representative efforts, yes?
You'll not I also have the commands for the button in there. You probably won't fire up your scroll from a button, but if you ever want to--here it is. The button is created simply to house an onClick() Event Handler that triggers the function to run.
You'll note the line is actually on two lines here in the display. That's only because of space constraints. This actually should go all on one line.
The only thing that has changed is the text "window.status" is now the hierarchy statement "document.TheForm.display.value". That text is directing the output of the scroll to act as the value for the text box, "display", inside the form, "TheForm", on the HTML document.
Just those few changes sent the output of the scroll to a text box. Nothing to it.