SMF Integration in Joomla - how to avoid css conflict

[rikk]

Hi,

I am newbee in Smf and I have integrate v.2.05 in Joomla with JFusion plughin
but I have a problem because css conflict of default theme.
The first une is the #header tag have same name in my Joomla Theme: how to
rename it in SMF?
The second is that button in new topic or reply topic is shown as text instead of image,
probably another css conflict: someone can tell me how avoid this conflict too?

Thank's and regards

Rikk