update id system -- now control and layer divs take their classname and add a random number

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1411 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control.js

@@ -31,6 +31,8 @@ OpenLayers.Control.prototype = {
      */
     initialize: function (options) {
         Object.extend(this, options);
+        
+        this.id = OpenLayers.Util.createUniqueID(this.CLASS_NAME + "_");
     },
 
     /**
@@ -60,10 +62,7 @@ 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;
-            }
+            this.div.id = this.id;
         }
         if (px != null) {
             this.position = px.clone();