Thanks for the info. I am currently trying to resolve my issues using conditional comments (
Wikipedia). As these are only interpreted by IE, I think this allows to sepcifically adapt elements to IE.
For exemple, the privacy statment was displayed in a smaller font in IE than in Firefox. I added a conditional comment which defines a css-class which changes the size of a font:
<!--[if lte IE 7]>
<style type="text/css">
.groesser {font-size:14px;}
</style>
<![endif]-->
<!--[if lte IE 8]>
<style type="text/css">
.groesser {font-size:14px;}
</style>
<![endif]-->
I added this to the beginning of my privacy.pstpl file, and used it at the appropriate spot. I think this is a workable alternative to changing the template.css file until it is displayed correctly in all browsers...