Website moves a few pixels when changing the page

hi

 

i created website , works in safari. however, when opening site in ie, chrome , firefox, site moves few pixels when go pages. apparently has browsers adding scrollbar (see http://forums.adobe.com/message/4412350#4412350), want prevent because comes on buggy website... know solution? thnx!

 

i uploaded website on dropbox can view (might slow however):

https://dl.dropbox.com/u/17715131/merckx/index.html

"merken" problem page

i found 1 possibility, permanently adding scrollbar adding global css file:

 

html {
     overflow: -moz-scrollbars-vertical;
     overflow: scroll;
}

 

however, other solutions more welcome (e.g. letting scrollbar float on site safari does)

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