Transparency in IE

[dadli]

Hello experts.
IE not supported css property "opacity" yes? In IE not working:
testObj.style.opacity = 0.5

And for IE, I use this code:
testObj.style.filter = 'alpha(opacity=' + 50 + ')';
But As I understood, this variant: 'alpha(opacity=' + 50 + ')'; is for old IE versions and not the best variant, there is a better variants, but what is this variants, i am not found.

Please tell me, where is the optimal variant for transparency in IE?

P.S. Excuse me for many times word "variant", i know english not good

[rtrethewey]

style.filter = 'alpha(opacity)' is the only way to set opacity for older versions of Internet Explorer. Good luck!

[dadli]

OK, understood, Thanks very much, you also good luck