File -> Export ->HTML

[robi]

Hello,

1. with lyx-1.1.6 if I click on "View -> HTML" on a file 
containing mathematical expressions and graphic inserted,
(.ps created with xfig) I obtain a fine result.

2. If I do "File -> Export -> HTML" I obtain a .html file
and when I open it with nescape (4.76) I obtain a bad result:
all the files PNG are not present and those wich are present
do not position in the right place.
How can I do to obtain a fine result in the case 2 ?
Thanks for your comments and advices.

Gerard.