wow...Overlaping blocks trouble in ie 6 & 7

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Check this in IE8 or FF
http://www.mopupmedia.com/omegaweb/index.php/phlebologie/...

then...click on the "compatibility view" button included with IE8... or view it in either ie6 or 7.

Every main content block is on top of the other... making it all look like gibberish

help?