I have a client who wants me to make some of the text on his home page flash. This is one of the number one things that I cannot stand on a website. I hate to have to read something and have something in the corner of the page distracting me from reading.

Does anyone have any tips on how to explain to a client as to why this shouldn't be used without sounding like a jerk? I can understand wanting to attract attention to certain things, but it also takes it away from other areas and makes it hard to read.