css coding for semi-transparent drop down menu

using the following code to try and get a semi-transparent drop down menu (drop down originally created in Fireworks and then imported webpage into Dreamweaver). No matter what I do the dropdown is COMPLETELY transparent. Working on Mac and testing in Safari and Firefox.

Thank you.

#MMMenuContainer0627152508_1 a {
/* Controls the general apperance for menu MMMenuContainer0627152508_1's items, including color and font */
      font-family:Verdana, Arial, Helvetica, sans-serif;
      background-color:#ffffff, filter:alpha(opacity=40);opacity: .4;-moz-opacity: .4;
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try opacity:0.4 instead of .4

and try a color other than white to make sure.
Give the element that you're applying the filter to a css height or width.
pixellight1Author Commented:
neither one of the solutions proposed worked. After more time I found that the code above worked when I placed it in another section of the css code. So it looks like I had the right code in the wrong place. Thank you for your attempts.

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