Quicktag and Mozilla

I am using <span style="font:18pt times,serif;float:right;color:brown;margin:3px 0 8px 8px;padding:3px;border:solid 1px #ccc;"> followed by an image tage to float a picture. In Mozilla all I see is a small gray box without the image. In I.E. it appears to be working fine. Any ideas?