How to dynamically change image in a sprite in cocos2D iphone?

//Dynamically change the sprite image......
//my_sprite is a CCSprite already initialized with spriteWithFile.
[[CCTextureCache sharedTextureCache] removeTexture:[self.my_sprite texture];
CCTexture2D *tex = [[CCTextureCache sharedTextureCache] addImage:@"new_image.jpg"];
[my_sprite setTexture:tex];