diff --git a/CHANGELOG b/CHANGELOG
index 60a3c6e..dd8e961 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Add optional third parameter "camlized" to Element.setStyle, for optimized performance if style names are known to be camelCased.  [Thomas Fuchs]
+
 * Fix a bug in the simulated hasAttribute for IE due to getAttributeNode sometimes returning null.  [sam]
 
 * Optimize Element.getStyle and add new Element.getOpacity method. Special case IE and Opera getStyle methods.  Closes #7648.  [Tobie Langel, Thomas Fuchs]
diff --git a/src/dom.js b/src/dom.js
index b4eaa02..a342f62 100644
--- a/src/dom.js
+++ b/src/dom.js
@@ -315,7 +315,7 @@ Element.Methods = {
     return $(element).getStyle('opacity');
   },
   
-  setStyle: function(element, styles) {
+  setStyle: function(element, styles, camelized) {
     element = $(element);
     var elementStyle = element.style;
 
@@ -323,7 +323,8 @@ Element.Methods = {
       if (property == 'opacity') element.setOpacity(styles[property])
       else 
         elementStyle[(property == 'float' || property == 'cssFloat') ?
-          (elementStyle.styleFloat === undefined ? 'cssFloat' : 'styleFloat') : property.camelize()] = styles[property];
+          (elementStyle.styleFloat === undefined ? 'cssFloat' : 'styleFloat') : 
+          (camelized ? property : property.camelize())] = styles[property];
 
     return element;
   },
diff --git a/test/unit/dom.html b/test/unit/dom.html
index 795b43f..57fecf6 100644
--- a/test/unit/dom.html
+++ b/test/unit/dom.html
@@ -630,6 +630,15 @@
       assertEqual(0, $('style_test_3').getStyle('opacity'));
     }},
     
+    testElementSetStyleCamelized: function() { with(this) {
+      $('style_test_3').setStyle({ marginTop: '30px'}, true);
+      assertEqual('30px', $('style_test_3').style.marginTop);
+      
+      // This would work if camelized parameter is false
+      $('style_test_3').setStyle({ 'margin-top': '20px'}, true);
+      assertEqual('30px', $('style_test_3').style.marginTop);
+    }},
+    
     testElementSetOpacity: function() { with(this) {
       [0,0.1,0.5,0.999].each(function(opacity){
         $('style_test_3').setOpacity(opacity);