function showAddress() {
  var address="昆明市官渡区六甲乡"; //获取字段的值
	map = new GMap2(document.getElementById("mymap"));
	geocoder = new GClientGeocoder();
  if (geocoder) {
	geocoder.getLatLng(
	  address,
	  function(point) {
		  map.setCenter(point, 13); //缩放的级别,数字越大精度越高,最高不超过22,建议设置13到15
		  var marker = new GMarker(point);
		  map.addOverlay(marker); //显示地图标记
		  marker.openInfoWindowHtml(address);
		  map.addControl(new GSmallMapControl());//显示地图缩放控制条,此处为小控制条.
		  map.enableDoubleClickZoom(); //支持双击缩放

	  }
	);
  }
}
window.onload=showAddress;