IE6 opacity problems

[Fiasst]

Hi,

I'm having problems getting images to appear semi-transparent in IE6 using CSS. I have IE6 but it's not a good instalation since I tried - and failed to install IE7 whilst keeping IE6.

I've added a test page below with 2 images using diffrent style classes.

Could someone with IE6 tell me if either work? I really can't trust my installation.

If not, can you see a problem with my CSS?

example page (http://realworksmedia.com/ztest/ie-opacity-test.htm)

(I was advised to add 'zoom: 1;' for IE to recognize the opacity.)

Thanks!