how to get an alert when hard disk is nearly full?

Hello! A few days ago, I set up a Ksysguard applet in my (task)bar to know how much my hard disk is filled. There is also a possiblity to ask for an alert when it reaches a certain percentage. This alert, if I understand it well consists in the percentage changing of color. That's nearly what I wanted to have. In this case, I have to regularly have a look at this little figure to make sure I am not using too much disk space. Is there a possibility to get a small dialog box telling me that I've exceeded an certain level? Maybe even without that applet displayed? Thanks for you help! Patrick -- config: 8.2 / KDE 3.1