Do you have a page that will not work with Microsoft Explorer? Use this script on your page. IE users will be given an alert box that tells them, then offers the choice of leaving or staying.
Please note: This script is being offered in simple text format. When you click to Grab the Script, the text should display. Internet Explorer and AOL users may get a blank page or the script may run and produce the effect. If this happens, choose SAVE AS from the FILE menu and save the blank or compiled page.