I am using [jVectorMap](http://jvectormap.com/) to display an interactive map. Currently I can select multiple regions at the same time, but my requirement is to only allow the selection of one at a time. How can this be done? 

```
$('#world-map').vectorMap({
    backgroundColor: '#0099FF',
    /* Hover color for each state */
    hoverColor: '#FCEF06',
    hover: {
        stroke: 'black',
        "stroke-width": 2,
        fill:'#FCEF06'
    },
    onRegionClick: function(event, code)
    {
        alert(code);
    },
    regionsSelectable: true,
    regionStyle: {
        fill:'black',
        selected: {
            fill: 'red'
        }
    },
});

```

```
<div id="world-map" style="width:750px; height:380px; float:left;"></div>

```