Oracle Forms

In Forms 6i, does the file type for an icon to be displayed on a button have to be .ico? We are thinking of having our buttons re-done by a design firm and will be going to Forms 9i sometime next year. It would be nice if we could use the same files for 9i as we need right now for 6i.

I have some other questions too from our marketing guy:
1) I'm asking a design firm for a quote to convert them from button-looking 1980's things to Windows-looking icons. When the user mouseovers the icon, it would appear as a button (like in all MS apps), and when they have no use, they would appear greyed out. Does Oracle support the mouseover state?

2) Can you put a grey pipe between groups of similar icons, like in MS apps?

3) Any special concerns or issues with having icons with the word appearing to the right of the icon ?

4) How about the grey line that appears under the menu names and on top of the toolbar icons (the separator line) - can you paint that line in Oracle Forms 6i? What about 9i?

Thanks.