Dynamically Change Opacity

Mar 2, 2007

i want to change an images opacity dynamically in mozilla.
im doing it when clicking a button. yhe code used is as follows.

document.getElementById('id').style.-moz-opacity =.5;
but it is not working. i know the problem is with

style.-moz-opacity
assignment. can anyone tell me a best solution.

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[Code]...

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