diff --git a/lib/OpenLayers/Format/WFS.js b/lib/OpenLayers/Format/WFS.js
index f5a51b94e9..e45bf83940 100644
--- a/lib/OpenLayers/Format/WFS.js
+++ b/lib/OpenLayers/Format/WFS.js
@@ -58,7 +58,7 @@ OpenLayers.Format.WFS = OpenLayers.Class(OpenLayers.Format.GML, {
      */
     write: function(features) {
         
-        var transaction = document.createElementNS('http://www.opengis.net/wfs', 'wfs:Transaction');
+        var transaction = this.createElementNS('http://www.opengis.net/wfs', 'wfs:Transaction');
         transaction.setAttribute("version","1.0.0");
         transaction.setAttribute("service","WFS");
         for (var i=0; i < features.length; i++) {
@@ -85,9 +85,9 @@ OpenLayers.Format.WFS = OpenLayers.Class(OpenLayers.Format.GML, {
      */ 
     createFeatureXML: function(feature) {
         var geometryNode = this.buildGeometryNode(feature.geometry);
-        var geomContainer = document.createElementNS(this.featureNS, "feature:" + this.geometryName);
+        var geomContainer = this.createElementNS(this.featureNS, "feature:" + this.geometryName);
         geomContainer.appendChild(geometryNode);
-        var featureContainer = document.createElementNS(this.featureNS, "feature:" + this.featureName);
+        var featureContainer = this.createElementNS(this.featureNS, "feature:" + this.featureName);
         featureContainer.appendChild(geomContainer);
         for(var attr in feature.attributes) {
             var attrText = document.createTextNode(feature.attributes[attr]); 
@@ -95,7 +95,7 @@ OpenLayers.Format.WFS = OpenLayers.Class(OpenLayers.Format.GML, {
             if (attr.search(":") != -1) {
                 nodename = attr.split(":")[1];
             }    
-            var attrContainer = document.createElementNS(this.featureNS, "feature:" + nodename);
+            var attrContainer = this.createElementNS(this.featureNS, "feature:" + nodename);
             attrContainer.appendChild(attrText);
             featureContainer.appendChild(attrContainer);
         }    
@@ -110,7 +110,7 @@ OpenLayers.Format.WFS = OpenLayers.Class(OpenLayers.Format.GML, {
      * feature - {<OpenLayers.Feature.Vector>} 
      */
     insert: function(feature) {
-        var insertNode = document.createElementNS(this.wfsns, 'wfs:Insert');
+        var insertNode = this.createElementNS(this.wfsns, 'wfs:Insert');
         insertNode.appendChild(this.createFeatureXML(feature));
         return insertNode;
     },
@@ -124,24 +124,24 @@ OpenLayers.Format.WFS = OpenLayers.Class(OpenLayers.Format.GML, {
      */
     update: function(feature) {
         if (!feature.fid) { alert("Can't update a feature for which there is no FID."); }
-        var updateNode = document.createElementNS(this.wfsns, 'wfs:Update');
+        var updateNode = this.createElementNS(this.wfsns, 'wfs:Update');
         updateNode.setAttribute("typeName", this.layerName);
 
-        var propertyNode = document.createElementNS(this.wfsns, 'wfs:Property');
-        var nameNode = document.createElementNS('http://www.opengis.net/wfs', 'wfs:Name');
+        var propertyNode = this.createElementNS(this.wfsns, 'wfs:Property');
+        var nameNode = this.createElementNS('http://www.opengis.net/wfs', 'wfs:Name');
         
         var txtNode = document.createTextNode(this.geometryName);
         nameNode.appendChild(txtNode);
         propertyNode.appendChild(nameNode);
         
-        var valueNode = document.createElementNS('http://www.opengis.net/wfs', 'wfs:Value');
+        var valueNode = this.createElementNS('http://www.opengis.net/wfs', 'wfs:Value');
         valueNode.appendChild(this.buildGeometryNode(feature.geometry));
         
         propertyNode.appendChild(valueNode);
         updateNode.appendChild(propertyNode);
         
-        var filterNode = document.createElementNS('http://www.opengis.net/ogc', 'ogc:Filter');
-        var filterIdNode = document.createElementNS('http://www.opengis.net/ogc', 'ogc:FeatureId');
+        var filterNode = this.createElementNS('http://www.opengis.net/ogc', 'ogc:Filter');
+        var filterIdNode = this.createElementNS('http://www.opengis.net/ogc', 'ogc:FeatureId');
         filterIdNode.setAttribute("fid", feature.fid);
         filterNode.appendChild(filterIdNode);
         updateNode.appendChild(filterNode);
@@ -161,11 +161,11 @@ OpenLayers.Format.WFS = OpenLayers.Class(OpenLayers.Format.GML, {
             alert("Can't delete a feature for which there is no FID."); 
             return false; 
         }
-        var deleteNode = document.createElementNS(this.featureNS, 'wfs:Delete');
+        var deleteNode = this.createElementNS(this.featureNS, 'wfs:Delete');
         deleteNode.setAttribute("typeName", this.layerName);
 
-        var filterNode = document.createElementNS('http://www.opengis.net/ogc', 'ogc:Filter');
-        var filterIdNode = document.createElementNS('http://www.opengis.net/ogc', 'ogc:FeatureId');
+        var filterNode = this.createElementNS('http://www.opengis.net/ogc', 'ogc:Filter');
+        var filterIdNode = this.createElementNS('http://www.opengis.net/ogc', 'ogc:FeatureId');
         filterIdNode.setAttribute("fid", feature.fid);
         filterNode.appendChild(filterIdNode);
         deleteNode.appendChild(filterNode);