I have fallen in love with this ticker script, but seem unable to control it...

I'm referring to the great RSS feed ticker in this tutorial:
http://www.javascriptkit.com/dhtmltu...er/index.shtml

I hope this is the correct forum to ask in. I need to know if it is possible to control the displayed description length so the box height doesn't jump around.

Do I do this in th PHP script or in the javascript?