> Yup, effect.js is just doing a parseFloat on the paired background
> position value, which only returns the first value and tosses the
> second. Line 965 in 1.8.1.

> On Jul 31, 1:07 am, kangax <kan...@gmail.com> wrote:

> > On Jul 30, 1:06 pm, Diodeus <diod...@gmail.com> wrote:

> > > Nope, that doesn't work, nor does it explain why horizontal
> > > positioning woks, but vertical positioning does not.

> > > On Jul 30, 12:36 pm, sunn <jo...@kolben.se> wrote:

> > > > This
> > > > new Effect.Morph('a',{style:'background-position:-50px 0px'})
> > > > should probably be like
> > > > new Effect.Morph('a',{background-position:'-50px 0px'})
> > > > (from your test script -http://jameslab.moveable.com/morph/test.htm)

> > > > the second argument is the styles objecthttp://github.com/madrobby/scriptaculous/wikis/effect-morph

> > > > On 30 Juli, 17:03, Diodeus <diod...@gmail.com> wrote:

> > > > > Effect.Morph is not working properly when changing the vertical
> > > > > background position of a CSS background image. (s version:1.8.1, p
> > > > > version :1.6.0)

> > > > > I'm trying to build a wipe effect. I'm making it appear as if the
> > > > > image splits and then wipes away, starting from the center. This
> > > > > worked well enough with making it split vertically and wipe
> > > > > horizontally; I make two DIVs (left, right) and   reduce the size of
> > > > > the left to zero. The right div I move right, while moving the
> > > > > position of the background to the left, so it appears the image is
> > > > > being wiped away without moving.

> > > > > The problem arises when I was building the second mode - horizontal
> > > > > split with a vertical wipe. The background image in the bottom half
> > > > > did not reposition, it it just appears as if it's sliding down.

> > > > > I did a test to see if Effect.Morph was the problem and it appears to
> > > > > be the case.

> > > > > Vertical split demo:http://jameslab.moveable.com/morph/wipe.htm
> > > > > Horizontal split demo:http://jameslab.moveable.com/morph/wipe2.htm
> > > > > Test script:http://jameslab.moveable.com/morph/test.htm

> > > > > If anyone has some insights I'd appreciate it.

> > I know that jQuery has a separate plugin specifically for animating
> > background position.http://plugins.jquery.com/project/backgroundPosition-Effect
> > Maybe effects.js is not able to parse the style properly.
> > Need to look into this.

> > --
> > kangax