TYPO3 Core

I learned that this is an IE issue (It's working as indented f.e. with Firefox)

I experienced this problem as well.
I wasn't able to find out the exact problem yet.

typo3 (ver.4) uses the following javascript statement to set the class attribute of the acitve page:

theObj.setAttribute("class", "navFrameHL");

This does not work for IE. You have to use

theObj.setAttribute("className", "navFrameHL");

For a rough and dirty solution you may change in typo3/alt_db_navframe.php (and in
typo3/alt_file_navframe.php) the function hilight_row():

Replace

if (theObj)    {
            theObj.setAttribute("class", "");
        }

by

if (theObj)    {
            theObj.setAttribute("class", "");
            theObj.setAttribute("className", "");
        }

and replace

if (theObj)    {
            theObj.setAttribute("class", "navFrameHL");
        }

by

if (theObj)    {
            theObj.setAttribute("class", "navFrameHL");
            theObj.setAttribute("className", "navFrameHL");
        }

Just a workaround no good programming style.

Greetings,
Armin

Could not reproduce and should be fixed with 4.1 and all of the above, ok?