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I can understand you use Microsoft Frontpage.
Usually that program does more harm than actual good. It codes in a very messy manner and often with MSIE specific tags (ie. non-standard HTML). My experience is, that using Frontpage or other similar tools is simply asking for trouble.
My advice is to throw out the program and code by hand, possibly assisted by a smart editor such as EditorPlus2. This will give a better, sleeker and faster code, which will be far easier to debug.
Not much help, I know. Just my experience.