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IE7 CSS z-index issue not apparent on any other browser
#screen {
    display: none;
    background-image: url('/images/bg.png');
    background-repeat: repeat;
    position: fixed;
    top: 0px;
    left: 0px;
    min-width: 100%;
    min-height: 100%;
    z-index: 10000;
}

<div id="screen"></div>

<div id="r_box">
    <div id="message_panel">
        ...Content in here...
    </div>
</div>

#r_box
{
    width: 335px;
    height: 337px;
    background: url("/images/panel.png") no-repeat scroll 0 0 transparent;
    position: fixed;
    margin-left: -150px;
    margin-top: -130px;
    left: 50%;
    top: 50%;
    z-index: 10001;
    display: none;
}

#r_box #message_panel {
    color: #fff;
    z-index: 10001;
    bottom: 95px;
}