I you use a parent container, and i guess it has, you can get something really close with little CSS. http://jsfiddle.net/u7tYE/3382/
#all:hover div {
background:#ccc;
}
#all:hover div:hover {
background:none;
}
<div id="all">
<div id="a">Div A</div>
<div id="b">Div B</div>
<div id="c">Div C</div>
<div id="d">Div D</div>
</div>