Merge pull request prototypejs#69 from victor-homyakov/patch-22

Clear element creation cache in IE on page unload.

Author: savetheclocktower

src/prototype/dom/dom.js

@@ -3468,5 +3468,14 @@
   }
 
   Element.addMethods(methods);
-  
+
+  // Prevent IE leaks on DIV and ELEMENT_CACHE
+  function destroyCache_IE() {
+    DIV = null;
+    ELEMENT_CACHE = null;
+  }
+
+  if (window.attachEvent)
+    window.attachEvent('onunload', destroyCache_IE);
+
 })(this);