Problmes with IE and Firefox in EM

Problmes with IE and Firefox in EM

  
Hi,
I'm using Enterprise Manager and I'm having some problems with both IE and firefox In the first, everything appears correctly but the transparent icon on the tree.
In the second, the icon is ok, but the size of the window isn't the correct one.
Anyone with a similar problem?
Thank's in advance,
Best Reagrds,
Francisco Neto