It looks like you have some rather large images which are the main culprit. Here's a speed report from WebSiteOptimization.com.
Most of your images are made up of solid blocks of color too so you don't even need them. they can easily be replaced with some code. A background color on a div for instance. You should also optimize http://www.j22-mode.nl/fotos/voor_winkel_mini.png That image is 180 kb and at that size could probably ne less than 10 kb.
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