DirectX 9 "unresolved external symbol" problem

I have been working on learning DirectX for a couple days and have run into a problem. I have been following a books example and have solved several annoying problems that have come up, but have been unsuccessful at solving my most recent one. The compiler states that I have an unresolved external symbol whenever I try to compile. Here is the error code below.

1>game.obj : error LNK2019: unresolved external symbol "struct IDirect3DSurface9 * __cdecl 
LoadSurface(char *,unsigned long)" (?LoadSurface@@YAPAUIDirect3DSurface9@@PADK@Z) referenced in
function "int __cdecl Game_Init(struct HWND__ *)" (?Game_Init@@YAHPAUHWND__@@@Z)
1>C:\Users\Christopher\Documents\Visual Studio 2008\Projects\Work\Debug\Work.exe : fatal error
LNK1120: 1 unresolved externals

I am running: [compiler: Visual Studios 2008] [Operating system: Windows 7 64bit professional]

Here a sample of the code and where it seem to be taking place. (I hope I gave enough info)

LPDIRECT3DSURFACE9 kitty_image[7];
SPRITE kitty;
LPDIRECT3DSURFACE9 back;

//timing variable
long start = GetTickCount();

//initializes the game
int Game_Init(HWND hwnd)
{
char s[20];
int n;

//set random number seed
srand(time(NULL));

//load the sprite animation
for (n=0; n<6; n++)
{
    sprintf(s, "cat%d.bmp",n+1);
    k开发者_StackOverflow社区itty_image[n] = LoadSurface(s, D3DCOLOR_XRGB(255,0,255));
    if (kitty_image[n] == NULL)
        return 0;
}

back = LoadSurface("background.bmp", NULL );


//initialize the sprite's properties
kitty.x = 100;
kitty.y = 150;
kitty.width = 96;
kitty.height = 96;
kitty.curframe = 0;
kitty.lastframe = 5;
kitty.animdelay = 2;
kitty.animcount = 0;
kitty.movex = 8;
kitty.movey = 0;

//return okay
return 1;
}

I have linked both d3d9.lib and d3dx9.lib to my project and have included all neccesary header files that I know of (d3d9.h, d3dx9.h). Any help is greatly appreciated! Thanks in advance!!!

It looks like the linker is complaining that there is no such function LoadSurface. Where did you define it?