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Check the resulting code in a browser, and then run it through the W3C validator to make sure all is well.
...oh and welcome to WebmasterWorld
luck,
robert
FP will make perfectly validating HTML or XHTML sites if you just start out trying to make a validating site instead of trying to fix something previously where this was not the primary focus. You say you're having problems not only with validating, but even with viewing the site in Mozilla based browsers. It sounds like you might want to take a step back and design a validating, cross browser compatible, template and then put your content into that rather than trying to fix what you have. There is no magic bullet software that will clean up everything for you. You have to recognize these validation issues from the initial design phase and then understand your WYSIWYG's limitations and work around them. It's not really all that difficult, but you may have to change some of your design concepts.