The span element is usually used to set styles on certain blocks of text,
often where a div or paragraph element would be cumbersome or not a good
idea. A lot of times the span's will show up when using a copy and paste
from another office application like word directly into FrontPage. If this
is the reason, it may be best to copy into another program first, such as
notepad, in order to loose a lot of this funky office formatting.
Hope this helps,
Mark Fitzpatrick
Microsoft MVP - FrontPage