I have a template designed with a large editable region for text/images etc. When the text inserted into the editable region exceeds its original size and has to lengthen the template lenghtens too, stretching buttons etc. that are in the side navigation bar.
Is there a quick fix for this (i.e. code I should be including to tell the template no to resize) as I would imagine there would be?
It sounds like you let Photoshop or Fireworks generate the html for you, creating lots of rowspans and colspans in a fragile layout that breaks easily.
If this is the case, unfortunately, there's no quick fix for that type of code. It has nothing to do with your use of a template, and everything to do with the structure of the underlying code. You'll need to spend some time creating the template yourself in Dreamweaver, using your Photoshop-generated images but structuring your code so that it allows for the addition of text and other content in your editable area without breaking.