<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=7" />
<title>Create Map</title>
<link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/1.5/js/dojo/dijit/themes/tundra/tundra.css">
<script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=1.5"></script>
<script type="text/javascript">
dojo.require("esri.map");
dojo.require("esri.tasks.geometry");
var wgs84 = new esri.SpatialReference({ "wkid": 4326 });
var map = null;
var gsvc = null;
function init() {
map = new esri.Map("map");
var tiledMapServiceLayer = new esri.layers.ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_Imagery_World_2D/MapServer");
map.addLayer(tiledMapServiceLayer);
dojo.connect(map, "onLoad", addIcons);
gsvc = new esri.tasks.GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");
map.on("click", doBuffer);
}
function addIcons(){
var geometry = new esri.geometry.Point(-78.082988, 0.1998445, wgs84);
symbol = new esri.symbol.PictureMarkerSymbol('http://gmaps-samples.googlecode.com/svn/trunk/markers/blue/blank.png', 30, 30);
var g = new esri.Graphic(geometry, symbol)
map.graphics.add(g);
geometry = new esri.geometry.Point(-78.135, 0.3455, wgs84);
symbol = new esri.symbol.PictureMarkerSymbol('http://gmaps-samples.googlecode.com/svn/trunk/markers/blue/blank.png', 30, 30);
g = new esri.Graphic(geometry, symbol)
map.graphics.add(g);
}
function zoomto(x,y){
map.centerAndZoom(new esri.geometry.Point(x,y, wgs84), 9)
}
dojo.addOnLoad(init);
</script>
</head>
<body class="tundra">
<input type="button" value="click primer punto" onclick="zoomto(-78.082988, 0.1998445)" />
<input type="button" value="click segundo punto" onclick="zoomto(-78.135, 0.3455)" />
<div id="map" style="width:900px; height:600px; border:1px solid #000;"></div>
</body>
</html>
Resultado será: