css - div on top of div with Google Maps API

Question

How do I float a div "menu" on top of my Google Maps API "map" div. And maybe possibly add a transparency of 50% on the menu div. Can this be done?

#map {width: 835px; height 540px; float: left;}
#menu {width: 145px; float: right; padding-top: 10px;}

<div id="map"></div>
<div id="menu"></div>

Answer 1

Can't you changed the positions of the DIVs like this:

<div id="menu"></div>
<div id="map"></div>

If not you could go something like this:

<div id="map"></div>
<div id="menu"></div>

#menu
{
    position: absolute;
    top: 10px;  /* adjust value accordingly */
    left: 10px;  /* adjust value accordingly */
}

Update 2

Cross-browser transparency style:

.dropSheet
{
    background-color: #000000;
    background-image: none;
    opacity: 0.5;
    filter: alpha(opacity=50);
}

Just apply the class dropSheet to the element you want to make transparent.