dashed off in about an hour: http://www.crashcourse.ca/wiki/index.php/Proc_interrupts eventually, all these tutorials will be reorganized and will allow reader comments so you can give feedback and ask questions. enjoy. rday -- ======================================================================== Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================