[jQuery] fadeTo fades up in Safari and FF, down in IE

I have an element with this style associated with it:
    filter:alpha(opacity=0);
    -moz-opacity: 0;
    opacity: 0;
Now, I fade it in:
$(object).fadeTo(1000, 0.8);
In FF and Safari, this results in the object fading from 0% to 80%
opacity. But in IE, it makes the object pop in at 100% opacity, then
fades down to 80%.
Has anyone seen this before? What am I doing wrong?
Thanks,
Aaron