Modal popup opacity doesn't work with safari

I have a modal popup that works fine with IE and firefox but with safari the opacity doesn't work. I am using a css stylesheet to set the background opacity. What is the css commands to set opacity for safari
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CodeCruiserConnect With a Mentor Commented:
Thank you very much for being so kind to reply to this. We are obliged sir.
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   * -khtml-opacity: 0.7; Used for Transparency on old versions of Safari
    * opacity: 0.7; The current CSS standard, Supports Transparency with all recent versions of Firefox,   Opera and Safari.
whiwexAuthor Commented:
Haven't been able to get this working Please close this as unresolved
whiwexAuthor Commented:
Can't get this to work.
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