overviewmap.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/2000/REC-xhtml1-20000126/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Overview Map Example</title>
<script src="../lib/OpenLayers.js" type="text/javascript"></script>
<style>
#map{
width:100%;
height:500px;
border:1px solid;
}
</style>
</head>
<body>
<div id="map"></div>
<script defer="defer" type="text/javascript">
var map = new OpenLayers.Map('map');
// my city
var constantina = new OpenLayers.LonLat(-5.6165,37.8623);
var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
"http://labs.metacarta.com/wms/vmap0", {layers: 'basic'} );
var nasa_wms = new OpenLayers.Layer.WMS( "NASA Global Mosaic",
"http://wms.jpl.nasa.gov/wms.cgi", {layers: "modis,global_mosaic"} );
map.addLayers([
nasa_wms,
wms
]);
map.addControl(new OpenLayers.Control.LayerSwitcher());
var options = {
layers: [wms.clone()],
minRatio: 8,
maxRatio: 128
};
var overview = new OpenLayers.Control.OverviewMap(options);
map.addControl(overview);
map.setCenter(constantina, 4);
overview.maximizeControl();
</script>
</body>
</html>