Whenever this question is asked, the answer is always "Please, do not do it"
Here is part of a reply from J.E McGimpsey some time ago:
US Government sites are prohibited by law from displaying flashing text
(between 2 and 55 Hz) due to triggering seizures in those with
photosensitive epilepsy. http://www.section508.gov/IRSCourse/mod02/021401--.html
Many other organizations try to conform to section 508.
I wouldn't recommend that you use blinking text. It is rather
annoying. However, if you want to do it, you need to use VBA code and
a timer. See http://www.cpearson.com/Excel/BlinkingText.aspx for
example code.
Cordially,
Chip Pearson
Microsoft MVP
Excel Product Group
Pearson Software Consulting, LLC www.cpearson.com
(email on web site)
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