<div id="panel-map-prewrapper">
                <div id="panel-map-wrapper">
                	<div id="panel-map"></div>
                </div>
</div>


where the css is:

#panel-map-prewrapper{
    width: auto;
    height: 500px;
}
#panel-map-wrapper {
     position:relative;
     height:auto;
}
#panel-map {
    width: 600px;
    height: 500px;
}