Ok, mistake number one, broken wysiwyg nonsense that tricks nubes into thinking they can make websites.
Don't know what that means, but it doesn't sound good. Must be some Expression specific nonsense.
Your best bet likely involves throwing that bloated buggy sweetly retarded cousin to Frontpage in the trash and actually working with the markup and CSS directly. Much like Dreamweaver, the only thing you can learn from Expression is how NOT to build websites.
You know... from your description it almost sounds like you're working with shudder frames... in which case welcome to 1997.
Though as Ryan said, without seeing the page in question anything we tell you is little more than wild guesses. We'd have to see it to dial in what's actually going wrong with it.