glut: Textures

I'm having a texture problem. I checked out some tutorials about glut (such as http://www.morrowland.com/ ) and learnt how to use textures. In its tutorials, the author uses this function to import JPG files: ( jpeg.lib and jpeglib.h is included, you can download this file, which includes jpeg.lib and jpeglib.h : http://www.morrowland.com/apron/tutorials/gl/gl_texture.zip ) LoadJPG function:

tImage *LoadJPG(const char *strFileName){
	struct jpeg_decompress_struct cinfo;
	tImage *pImageData = NULL;
	FILE *pFile;	
	if((pFile = fopen(strFileName, "rb")) == NULL) 
		return NULL;	
	jpeg_error_mgr jerr;	
	cinfo.err = jpeg_std_error(&jerr);
	jpeg_create_decompress(&cinfo);
	jpeg_stdio_src(&cinfo, pFile);
	pImageData = (tImage*)malloc(sizeof(tImage));
	jpeg_read_header(&cinfo, TRUE);
	jpeg_start_decompress(&cinfo);
	pImageData->channels = cinfo.num_components;
	pImageData->sizeX    = cinfo.image_width;
	pImageData->sizeY    = cinfo.image_height;
	int rowSpan = cinfo.image_width * cinfo.num_components;
	pImageData->data = ((unsigned char*)malloc(sizeof(unsigned char)*rowSpan*pImageData->sizeY));
	unsigned char** rowPtr = new unsigned char*[pImageData->sizeY];
	for (int i = 0; i < pImageData->sizeY; i++)
		rowPtr = &(pImageData->data[i * rowSpan]);
	int rowsRead = cinfo.output_height-1;
	while (cinfo.output_scanline < cinfo.output_height) 
	{ rowsRead -= jpeg_read_scanlines(&cinfo, &rowPtr[rowsRead], cinfo.output_height - rowsRead); }
delete [] rowPtr;
	jpeg_finish_decompress(&cinfo);
	jpeg_destroy_decompress(&cinfo);
	fclose(pFile);
	return pImageData;
}

and the function i use to load textures:

bool Load_Texture(UINT &texture, LPSTR strFileName)
{	if(!strFileName)  return false;
	tImage *pImage = NULL;
	pImage = LoadJPG(strFileName);
	if(pImage == NULL)	return false;
	glGenTextures(1, &texture);
	glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
	glBindTexture(GL_TEXTURE_2D, texture);
	int textureType = GL_RGB;
	if(pImage->channels == 4)
		textureType = GL_RGBA;
	gluBuild2DMipmaps(GL_TEXTURE_2D, pImage->channels, pImage->sizeX, 
		pImage->sizeY, textureType, GL_UNSIGNED_BYTE, pImage->data);
	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
        glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
	if (pImage){
		if (pImage->data)	free(pImage->data);		
		free(pImage);
	}
	return true;
}

With the texture file included, it works fine (resolution of that file is 300x300) But when i try to use a texture file, it works like that: http://img225.imageshack.us/img225/9279/textureps2.jpg (the cube behind is the texture file included, the texture on the front is my texture (downloaded from NeHe, about blending). You see that my texture (128x128) has vertical lines on it. I made its resolution 300x300 and the problem wasn't solved. How can i solve this problem?