The browser most people use is also the browser most likely to fail to follow standards and the most likely to exhibit behaviour that is not standards-compliant. Given a discrepancy between Mozilla and IE, it's usually IE which is behaving incorrectly.

Given the enormous amount of code in the vB files, I haven't investigated further, since I thought someone here might know.

Dan, I don't know whether this is a vB issue or a browser issue or anything that is in any way configurable by FT. That's why I raised it here.