Web pages jumping in "firefox" not in IE

I have a really annoying problem. Web pages that I have produced in Dreamweaver with CSS seem to be jumping in Firefox when surfing from page to page. This does not occur in IE. Somehow it seems that the page layout change according to the text with little changes -> 3 mm jump to left or up etc.
This is making my website look very un professional... I would love to know what is the problem: is it in the CSS or in the html? Or is it just Firefox?
Thanks!

 

which url?

 

Maybe because some pages have a scrollbar and others don't? IE has a dummy scrollbar on every page. Add to style sheet;

html {
    height: 100.5%;
   }

Code (markup):

to force a vertical scrollbar.

cheers,

gary

 

Thank you! It seemed to fix my problem!
-Iines