Oxygen Style problem on IE

Hi!

I have a punbb forum running with the default Oxygen style.

In Firefox and Safari it looks ok... but not in IE...

I attach two screenshots:

IE screenshot: http://localhostr.com/file/Bkcw8T1/FERROR01.jpg

Firefox screenshot: http://localhostr.com/file/lFElQ5k/FOK01.jpg

Thanks in advance forhelp.