JS opacity in IE

[Fmdpa]

So in FF and Opera, the code is:

document.getElementById("img").style.opacity="50"

But what's the code for IE?

[Synook]

document.getElementById("img").style.filter = 'alpha(opacity=' + 0.5*100 + ')';

with some caveats, however: http://www.quirksmode.org/js/opacity.html.P.S. The CSS opacity property takes a value between 0 and 1. It's the IE filter that uses percentages.