[ubuntu-za] Evince as Default Viewer in Thunderbird on Ubuntu 8.04?

[vincent]

Can anybody give me advice on how to make Evince my default viewer in 
Thunderbird.

TB opens a box asking if I want to open a PDF or TIFF file in Image 
Viewer, or other, on selecting other. it only give's me F-Spot or Gimp 
as options, Evince used to be in this selection list but has disappeared 
off it - Neither of the remaining two, to my knowledge, can open 
multiple page files & I can't find a way to include Evince in this list.

In KMail, a drop down box ask's which app you want, type in Evince & it 
select's it.

The only method I've been able to use to open with Evince, is via the 
terminal & sudo - But I'd rather use the image viewer box, it's just 
quicker & simpler for an ex windows user. :-[

TIA
Vince