sub imgTop1_OnMouseOver()
  imgTop1.filters.gray.enabled = -1
end sub
sub imgTop1_OnMouseOut()
  imgTop1.filters.gray.enabled = 0
end sub

sub imgTop2_OnMouseOver()
  imgTop2.filters.gray.enabled = -1
end sub
sub imgTop2_OnMouseOut()
  imgTop2.filters.gray.enabled = 0
end sub

sub imgTop3_OnMouseOver()
  imgTop3.filters.gray.enabled = -1
end sub
sub imgTop3_OnMouseOut()
  imgTop3.filters.gray.enabled = 0
end sub