--- a/labs/openlayers/lib/OpenLayers/Control/Permalink.js
+++ b/labs/openlayers/lib/OpenLayers/Control/Permalink.js
@@ -1,1 +1,221 @@
-
+/* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for 
+ * full list of contributors). Published under the Clear BSD license.  
+ * See http://svn.openlayers.org/trunk/openlayers/license.txt for the
+ * full text of the license. */
+
+
+/**
+ * @requires OpenLayers/Control.js
+ * @requires OpenLayers/Control/ArgParser.js
+ */
+
+/**
+ * Class: OpenLayers.Control.Permalink
+ * The Permalink control is hyperlink that will return the user to the 
+ * current map view. By default it is drawn in the lower right corner of the
+ * map. The href is updated as the map is zoomed, panned and whilst layers
+ * are switched.
+ * `
+ * Inherits from:
+ *  - <OpenLayers.Control>
+ */
+OpenLayers.Control.Permalink = OpenLayers.Class(OpenLayers.Control, {
+    
+    /**
+     * APIProperty: argParserClass
+     * {Class} The ArgParser control class (not instance) to use with this
+     *     control.
+     */
+    argParserClass: OpenLayers.Control.ArgParser,
+
+    /** 
+     * Property: element 
+     * {DOMElement}
+     */
+    element: null,
+    
+    /** 
+     * APIProperty: base
+     * {String}
+     */
+    base: '',
+
+    /** 
+     * APIProperty: displayProjection
+     * {<OpenLayers.Projection>} Requires proj4js support.  Projection used
+     *     when creating the coordinates in the link. This will reproject the
+     *     map coordinates into display coordinates. If you are using this
+     *     functionality, the permalink which is last added to the map will
+     *     determine the coordinate type which is read from the URL, which
+     *     means you should not add permalinks with different
+     *     displayProjections to the same map. 
+     */
+    displayProjection: null, 
+
+    /**
+     * Constructor: OpenLayers.Control.Permalink
+     *
+     * Parameters: 
+     * element - {DOMElement} 
+     * base - {String} 
+     * options - {Object} options to the control. 
+     */
+    initialize: function(element, base, options) {
+        OpenLayers.Control.prototype.initialize.apply(this, [options]);
+        this.element = OpenLayers.Util.getElement(element);        
+        this.base = base || document.location.href;
+    },
+
+    /**
+     * APIMethod: destroy
+     */
+    destroy: function()  {
+        if (this.element.parentNode == this.div) {
+            this.div.removeChild(this.element);
+        }
+        this.element = null;
+
+        this.map.events.unregister('moveend', this, this.updateLink);
+
+        OpenLayers.Control.prototype.destroy.apply(this, arguments); 
+    },
+
+    /**
+     * Method: setMap
+     * Set the map property for the control. 
+     * 
+     * Parameters:
+     * map - {<OpenLayers.Map>} 
+     */
+    setMap: function(map) {
+        OpenLayers.Control.prototype.setMap.apply(this, arguments);
+
+        //make sure we have an arg parser attached
+        for(var i=0, len=this.map.controls.length; i<len; i++) {
+            var control = this.map.controls[i];
+            if (control.CLASS_NAME == this.argParserClass.CLASS_NAME) {
+                
+                // If a permalink is added to the map, and an ArgParser already
+                // exists, we override the displayProjection to be the one
+                // on the permalink. 
+                if (control.displayProjection != this.displayProjection) {
+                    this.displayProjection = control.displayProjection;
+                }    
+                
+                break;
+            }
+        }
+        if (i == this.map.controls.length) {
+            this.map.addControl(new this.argParserClass(
+                { 'displayProjection': this.displayProjection }));       
+        }
+
+    },
+
+    /**
+     * Method: draw
+     *
+     * Returns:
+     * {DOMElement}
+     */    
+    draw: function() {
+        OpenLayers.Control.prototype.draw.apply(this, arguments);
+          
+        if (!this.element) {
+            this.div.className = this.displayClass;
+            this.element = document.createElement("a");
+            this.element.innerHTML = OpenLayers.i18n("permalink");
+            this.element.href="";
+            this.div.appendChild(this.element);
+        }
+        this.map.events.on({
+            'moveend': this.updateLink,
+            'changelayer': this.updateLink,
+            'changebaselayer': this.updateLink,
+            scope: this
+        });
+        
+        // Make it so there is at least a link even though the map may not have
+        // moved yet.
+        this.updateLink();
+        
+        return this.div;
+    },
+   
+    /**
+     * Method: updateLink 
+     */
+    updateLink: function() {
+        var href = this.base;
+        if (href.indexOf('?') != -1) {
+            href = href.substring( 0, href.indexOf('?') );
+        }
+
+        href += '?' + OpenLayers.Util.getParameterString(this.createParams());
+        this.element.href = href;
+    }, 
+    
+    /**
+     * APIMethod: createParams
+     * Creates the parameters that need to be encoded into the permalink url.
+     * 
+     * Parameters:
+     * center - {<OpenLayers.LonLat>} center to encode in the permalink.
+     *     Defaults to the current map center.
+     * zoom - {Integer} zoom level to encode in the permalink. Defaults to the
+     *     current map zoom level.
+     * layers - {Array(<OpenLayers.Layer>)} layers to encode in the permalink.
+     *     Defaults to the current map layers.
+     * 
+     * Returns:
+     * {Object} Hash of parameters that will be url-encoded into the
+     * permalink.
+     */
+    createParams: function(center, zoom, layers) {
+        center = center || this.map.getCenter();
+          
+        var params = OpenLayers.Util.getParameters(this.base);
+        
+        // If there's still no center, map is not initialized yet. 
+        // Break out of this function, and simply return the params from the
+        // base link.
+        if (center) { 
+
+            //zoom
+            params.zoom = zoom || this.map.getZoom(); 
+
+            //lon,lat
+            var lat = center.lat;
+            var lon = center.lon;
+            
+            if (this.displayProjection) {
+                var mapPosition = OpenLayers.Projection.transform(
+                  { x: lon, y: lat }, 
+                  this.map.getProjectionObject(), 
+                  this.displayProjection );
+                lon = mapPosition.x;  
+                lat = mapPosition.y;  
+            }       
+            params.lat = Math.round(lat*100000)/100000;
+            params.lon = Math.round(lon*100000)/100000;
+    
+            //layers        
+            layers = layers || this.map.layers;  
+            params.layers = '';
+            for (var i=0, len=layers.length; i<len; i++) {
+                var layer = layers[i];
+    
+                if (layer.isBaseLayer) {
+                    params.layers += (layer == this.map.baseLayer) ? "B" : "0";
+                } else {
+                    params.layers += (layer.getVisibility()) ? "T" : "F";           
+                }
+            }
+        }
+
+        return params;
+    }, 
+
+    CLASS_NAME: "OpenLayers.Control.Permalink"
+});
+