I use http://validator.w3.org/ to see if there is some code error.
I couldn't find a thread on this topic (though I could be using the wrong terms. I created some webpages (using Dreamweaver) that display correctly in Firefox but not in IE7. In IE7, a logo appears at the bottom of the page which cuts off the text. You can view one of the pages at: http://edweb.sdsu.edu/schoolhouse/Cert/promo6.htm
I browsed to the page on two different computers, using Firefox and IE7. The IE7 page displays incorrectly on both but the Firefox page displays correctly on both. The logo that appears in my window is not in the source code anywhere I can find. Any thoughts?
I use Vista (don't get me started). Friends who use Macs don't see this problem.