function btn_change(number)
{
        if (document.images) 
        {
                document ["map"].src = state_img[number].src;
        }
}

function img_out(state) 
{
        if (document.images) 
        {
                document ["map"].src = state_img[state].src;
        }
}

if (document.images) 
{
        state_img = new Array(8);
        for (i = 0; i <= 8; i++) 
        {
                state_img[i] = new Image();
                state_img[i].src = "images/map_"+ i +".gif";
        }
        
}