Web browser compatibility

I made some changes of the header using firefox. Everything looks fine on firefox but looks messed up on IE. What should I do about it?

Thanks

try correcting the issues in your stylesheet :)

I tried. it's just don't know how because it looks fine on firefox.

is the site online? you have a link to it ?

if you use Firefox then I recommend the Firebug plugin, you can quickly locate the CSS for the element in question and tweak so it works in IE too