private void SetScrollValue (ScrollBar scrollbar, int val)
{
int max;
if (scrollbar == h_scroll)
max = h_scroll.Maximum - h_scroll.LargeChange + 1;
else
max = v_scroll.Maximum - v_scroll.LargeChange + 1;
if (val > max)
val = max;
else if (val < scrollbar.Minimum)
val = scrollbar.Minimum;
scrollbar.Value = val;
}