(Solved) Problems with IE8 and embedding a PHP-script

[jovo]

I discovered a problem with IE8.
In my website I embed a PHP-script with {embed url="...."}
In the options I have specified
{embed header=true}
The page is marked as non-cacheable.

It worked fine in all browsers except in IE8.
In IE8 only a part of the output is shown. No scrollbars.

In IE8 it displays only the correct output if the Compatibilty mode is selected (the button right of the addressbar)

The link is
http://www.tijdbalk-amersfoort.nl/cmsma ... op_periode

Sorry, the website is in Dutch...

Can I produce my output is such a way that IE8 displays the output correctly without the Compatibility mode?
If not: is it possible to check if IE8 is NOT set in Compatibility mode so I can warn the user?

Note: Mar 3 2010
After upgrade to 1.6.7 the problem has gone.
Waiting for IE9....