Just wondering whats the transparent color in avatar...

You set it yourself, when you make a GIF.

none.
U have to get an program that can save images with transparance (gifs), there u can choos the transparancy color.

Here is one : http://www.jpsnetwork.com/hosted/serialkiller/files/giffy23.zip
*this program choses the color in the left under pixel as transparancy color.

You could also use PNG which supports partial transparency, but since Micro$haft is stupid they haven't included full PNG support for IE. Bah, PNG is superior in every way to GIF.

</MicroRant>

PNG have animations? id use it then, but all ani pics i see are gif. anyway, just use a image editor (microsoft/adobe/jasc/the gimp but NOT paint) and there you go!

That's why MNG is being developed...