function load() {
if (GBrowserIsCompatible()) {        
var map = new GMap2(document.getElementById("map"));
map.addControl(new GSmallMapControl());
map.addControl(new GMapTypeControl());
map.setCenter(new GLatLng(center_n,center_w),  zoom);
var baseIcon = new GIcon();
baseIcon.shadow = "http://www.google.com/mapfiles/shadow50.png";
baseIcon.iconSize = new GSize(20, 34);
baseIcon.shadowSize = new GSize(37, 34);
baseIcon.iconAnchor = new GPoint(9, 34);
baseIcon.infoWindowAnchor = new GPoint(9, 2);
baseIcon.infoShadowAnchor = new GPoint(18, 25);

function createMarker(point, letter, desc) {  
// Create a lettered icon for this point using our icon class  
//var letter = String.fromCharCode(ico.charCodeAt(0) + index);  
var icon = new GIcon(baseIcon);  
icon.image = "http://www.google.com/mapfiles/marker" + letter + ".png";  
var marker = new GMarker(point, icon);  
GEvent.addListener(marker, "click", function() { marker.openInfoWindowHtml(desc);  });  return marker;}
var point;
for (var i=0;i<loc.length;i++)
{
point = new GLatLng(loc[i][0],loc[i][1]);
map.addOverlay(createMarker(point, loc[i][2], loc[i][3]));
//point = new GLatLng(loc[1][0],loc[1][1]);
//map.addOverlay(createMarker(point, loc[1][2]));
}

}
}