I put some thumbnails on page. Moiusedown and mousestilldown won't take
effect. Mouseleavedragging worked as mousedown on one thumb. Mouseenter and
mouseleave worked ok. The thumbs were resisting being picked up. 

It is so odd that mouseleavegragging worked as mousedown on only 1 thumb.
The other thumbs that were mouseleavedragging worked that way.

Thanks
Gary