private void picImage_MouseMove(object sender, MouseEventArgs e)
{
    Point p = picImage.PointToClient(Cursor.Position);
    Int32 coord = (e.Y + picImage.Padding.Top) * this.picWidth + e.X + picImage.Padding.Left;
    if (e.X < 0 || e.Y < 0 || coord > this.continentGuide.Length)
        return;
    Int32 continent = this.continentGuide[coord];
    if (continent == previousContinent)
        return;
    previousContinent = continent;
    if(this.continents.Length >= continent)
        return;
    this.lblContinent.Text = this.continents[continent];
    this.picImage.Image = GetHighlightPic(continent);
}