Help pls.

Can someone tell me how to re-size a .gif ? *animated* - without losing the animation?
//EDIT Or can someone re-size it for me?100x100 px
IMG 1: http://dl.fisier.ro/files/5gkogm7jobeffh1/Sookie_Romania_Flag_Button_Gif_by_sookiesooker.gif.html
IMG 2 : http://dl.fisier.ro/files/5gkogm7jobeffh1/Sookie_Romania_Flag_Button_Gif_by_sookiesooker.gif.html
IMG 3 : http://dl.fisier.ro/files/eb7pj45c77fi54o/Funny_kitty_gif_by_ValentinaCrespo.gif.html

*Thanks :) *