I too would join in the advice that there are much better ways to design than using tables... I prefer using a CMS (like Joomla) but thats not a route suitable for all..
however to answer the issue you are seeing i believe comes from not defining table widths, or definining them as incorrect % widths instead of pixel values so they change based on the window size.
when you select the table in dreamweaver you should have width and height options in the paramaters box.. just make sure these are set to a pixel value or 100%/50% etc if u want tables to fill certain areas.
just a guess as i've not used DW in a while and u didn't really give much info... but I think that will be the problem, just try having a play with width settings and then previewing
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