function TextualZoomControl() {
}

// To "subclass" the GControl, we set the prototype object to
// an instance of the GControl object
TextualZoomControl.prototype = new GControl();

// Creates a one DIV for each of the buttons and places them in a container
// DIV which is returned as our control element. We add the control to
// to the map container and return the element for the map class to
// position properly.
TextualZoomControl.prototype.initialize = function(map) {
  var container = document.createElement("div");
  //container.style.marginLeft = '570px';
  var zoomInDiv = document.createElement("div");
  this.setButtonStyle_(zoomInDiv);
  container.appendChild(zoomInDiv);
  var imageZoomIn = document.createElement('img');
  imageZoomIn.src = 'images/zoom-in.png';
  //zoomInDiv.appendChild(document.createTextNode("Zoom In"));
  zoomInDiv.appendChild(imageZoomIn);
  GEvent.addDomListener(zoomInDiv, "click", function() {
    map.zoomIn();
  });

  var zoomOutDiv = document.createElement("div");
  this.setButtonStyle_(zoomOutDiv);
  container.appendChild(zoomOutDiv);
 var imageZoomOut = document.createElement('img');
  imageZoomOut.src = 'images/zoom-out.png';
  //zoomInDiv.appendChild(document.createTextNode("Zoom In"));
  zoomOutDiv.appendChild(imageZoomOut);
  //zoomOutDiv.appendChild(document.createTextNode("Zoom Out"));
  GEvent.addDomListener(zoomOutDiv, "click", function() {
    map.zoomOut();
  });

  map.getContainer().appendChild(container);
  return container;
}

// By default, the control will appear in the top left corner of the
// map with 7 pixels of padding.
TextualZoomControl.prototype.getDefaultPosition = function() {
  return new GControlPosition(G_ANCHOR_TOP_RIGHT, new GSize(7, 7));
}

// Sets the proper CSS for the given button element.
TextualZoomControl.prototype.setButtonStyle_ = function(button) {
  button.style.textDecoration = "underline";
  button.style.font = "small Arial";
  button.style.marginBottom = "3px";
  button.style.textAlign = "center";
  button.style.cursor = "pointer";
}