sig help: border smoothing

how can i smoothe the .gif out so it looks like the .png one ?

gif:
http://www.mitglied.lycos.de/keeweek...est/jaguar.gif

png:
http://www.mitglied.lycos.de/keeweek...st/jaguar3.png

I am not pro but I think .gif sucks and it is just a waste of time to even try to make .gif as good quality as .png