This is my code. I copy and pasted two files into my project. SDL.dll, and SDL_image.dll are with my vcxpro files. I got this error.

Also:
I'm using Visual Studio

------ Build started: Project: SDL.Lesson4, Configuration: Debug Win32 ------
Build started 12/21/2012 9:24:27 PM.
InitializeBuildStatus:
Touching "Debug\SDL.Lesson4.unsuccessfulbuild".
ClCompile:
Main.cpp
SDLmain.lib(SDL_win32_main.obj) : error LNK2019: unresolved external symbol _SDL_main referenced in function _main
C:\Documents and Settings\Owner\My Documents\SDL.Lesson4\Debug\SDL.Lesson4.exe : fatal error LNK1120: 1 unresolved externals



Code:
#include"SDL_image.h"
#include<string>
SDL_Surface *load_image( std::string filename ) 
{
//The image that's loaded
SDL_Surface* loadedImage = NULL;

//The optimized image that will be used
SDL_Surface* optimizedImage = NULL;

//Load the image using SDL_image
loadedImage = IMG_Load( filename.c_str() );

//If the image loaded
if( loadedImage != NULL )
{

//Create an optimized image
optimizedImage = SDL_DisplayFormat( loadedImage );

//Free the old image
SDL_FreeSurface( loadedImage );
}

//Return the optimized image
return optimizedImage;
}
Did I miss anything?