CSS/JavaScript Use Div to grey out section of page

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Add this to your HTML:

<div id="darkLayer" class="darkClass" style="display:none"></div>

And this to your CSS:

.darkClass
{
    background-color: white;
    filter:alpha(opacity=50); /* IE */
    opacity: 0.5; /* Safari, Opera */
    -moz-opacity:0.50; /* FireFox */
    z-index: 20;
    height: 100%;
    width: 100%;
    background-repeat:no-repeat;
    background-position:center;
    position:absolute;
    top: 0px;
    left: 0px;
}

And finally this to turn it off and on with JavaScript:

function dimOff()
{
    document.getElementById("darkLayer").style.display = "none";
}
function dimOn()
{
    document.getElementById("darkLayer").style.display = "";
}

Change the dimensions of the darkClass to suite your purposes.

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