More intelligent hide/show/toggle

[rvagg]

show() uses display='' with possible override type toggle() uses display='block' with no possible override

they should determine most appropriate display value for the particular element either from existing style information or perhaps by creating virgin elements and testing them and caching the values for each element type.

hide() should probably save the old display value so that can be restored by show().

[ded]

with more intelligence comes a loss of speed. also, there's no true way of figuring this out — given the one case where an element could be display:none by default.

nevertheless, this does bring up an issue that i need to fix, whereby toggle really should be using the internal show, passing along an override.

[ded]

should have referenced the commit, but i addressed this in the lastest push

[rvagg]

I guess that'll do for now but I'd still like to tackle some intelligence at some point to see how it goes. The default to '' in toggle() is certainly a step forward!