Add working code for Markers -- marker layer and marker object. Also add markers.html to demo use of markers functionality.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@107 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Marker.js

@@ -28,8 +28,15 @@ OpenLayers.Marker.prototype = {
         this.lonlat = lonlat;
     },
     generateMarker: function(pixel) {
-        var markerObject;
-        // Create a div here, and set the location to the pixel above
+        // Create a div here, and set the location to the pixel above modified
+        // by the icon size.
+        var markerObject = OpenLayers.Util.createImage(
+            this.icon.url,
+            this.icon.size,
+            new OpenLayers.Pixel(
+              pixel.x-(this.icon.size.w/2), 
+              pixel.y-this.icon.size.h)
+            );
         return markerObject;
     } 
 }