udpate id's of control divs. This is for #226

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1398 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control.js

@@ -8,6 +8,9 @@
 OpenLayers.Control = Class.create();
 OpenLayers.Control.prototype = {
 
+    /** @type String */
+    id: null,
+    
     /** this gets set in the addControl() function in OpenLayers.Map
     * @type OpenLayers.Map */
     map: null,
@@ -57,6 +60,10 @@ OpenLayers.Control.prototype = {
     draw: function (px) {
         if (this.div == null) {
             this.div = OpenLayers.Util.createDiv();
+            this.div.id = "Control";
+            if (this.id != null) {
+                this.div.id += "_" + this.id;
+            }
         }
         if (px != null) {
             this.position = px.clone();