Opacity problem in Firefox

[benjrox]

Hey all,
On my MySpace, I have some tables that have 50% opacity. They work well in IE, but not Firefox.
The code I'm using is:
CSS:
[code].50trans {
    background-color: black;
    opacity:.50;
    filter: alpha(opacity=50);
    -moz-opacity:0.5;
}[/code]
HTML:
[code]<div class="content">
                    <tr>
                      <td class="50trans">
                        <table>
                        <tr>
                          <td>

                            <tr>[/code]My MySpace address is: [a href=\"http://www.myspace.com/roozbenjrox\" target=\"_blank\"]http://www.myspace.com/roozbenjrox[/a], if you want to compair in IE and FF.
Thanks!
Benj

[benjrox]

Don't worry, I fixed it.
I just set a PNG with 50% alpha as the background :)