Since I can't see what am I doing wrong, I'd like to know in short and to the point. What does a BMP file that I want to use as texture needs to be? (format, size, anything)
Thanks

Thanks Hagar, but I guess that's not the problem because I did all you said
Furthermore, I toke the sample texture from here-
http://airspace.uhk.cz/mlk/msfs/tutorials/gmax/part1/gmax_texturing_01.html
-and nothing happend on the Lavi. But when I tried it out on the sample model it showed out fine.......
Maybe it's something with the model......
Could it be?
Damn I'm hopeless....... I started 3 topics on this furom but none helped..........
Without texturing all the work on the model worth nothing.....
If you want to know, I actually start enjoying all this designing thing, since my model became, after a lot of effort, to something I can be proud at................ but it won't become a FS model if I can't put paint on him.................

Where are you not seeing it - in gmax or in FS2002?

If I understand the process correctly, your DXT3 texture is not seen in gmax, but it should be seen in FS2002.

You map your textures in gmax, using a tga, tiff, whatever, but it must be converted to a bmp to be displayed in FS2002.

I may be wrong, though.

Erez. Which format is your Lavi texture in? If it's an FS Extended texture format like DXT3, Gmax will not be able to read it. You need to create 2 different textures, one for Gmax & the other for the Texture folder in your aircraft. These would use exactly the same file names but be saved in their appropriate formats.

I have no idea which image formats are compatible with Gmax. If it will read 8 bit standard BMP images I would use this format for working textures. 8 bit BMPs are also compatible with FS2002 which would make things so much easier. When all the textures are assigned correctly you can replace them with the proper textures in whichever format you wish.

Hey Erez, try this: http://airspace.uhk.cz/mlk/msfs/tutorials/gmax/

G'luck

Erez. Please don't be so dramatic. LOL
This is only a small setback compared with what you will experience in this hobby. Many times over the past 4 years I've been almost in tears with frustration at my incompetence & lack of knowledge.

What you need to figure out is the difference between your Lavi model & the tube which you textured successfully. We've covered all the other options so the problem must lie somewhere in that model. Does it need configuring in some way to display textures? There has to be something you've overlooked. 

Hallelujah! I did it!
I Xrefed all the parts to a new file and it worked!

Well done............! See, I told you it would be something simple. Stick with it.