(chapter 9, "Timers in a web page" section, Scrolling Status Bar Text Example)

I tried changing the script so instead of starting in the middle of the status bar - the text will start from the right end of the status bar, I tried doing so by changing the number of spaces like:
   else
   {
      availWidth = 500;
      // document.body.scrollWidth / 10;

but no matter how many spaces I set it to, the only thing that changes is the amount of time that passes before I actually see the message showing up in the status bar, but again - from the middle and not from the right end.

how do I fix this? thanks alot.