diff --git a/gfx/public/nsIImageManager.h b/gfx/public/nsIImageManager.h
index 03b4b284437..40361ed2994 100644
--- a/gfx/public/nsIImageManager.h
+++ b/gfx/public/nsIImageManager.h
@@ -68,6 +68,12 @@ public:
    */
   virtual PRInt32 ShrinkCache(void) = 0;
 
+  /**
+   * Flush the image cache as much as possible. The only images not
+   * flushed out will be those that are in use.
+   */
+  NS_IMETHOD FlushCache(void) = 0;
+
   /**
    * Determine the type of the image, based on the first few bytes of data.  
    *
diff --git a/gfx/src/nsImageManager.cpp b/gfx/src/nsImageManager.cpp
index 5c4d969426e..2b526e3487f 100644
--- a/gfx/src/nsImageManager.cpp
+++ b/gfx/src/nsImageManager.cpp
@@ -38,6 +38,7 @@ public:
   virtual void SetCacheSize(PRInt32 aCacheSize);
   virtual PRInt32 GetCacheSize(void);
   virtual PRInt32 ShrinkCache(void);
+  NS_IMETHOD FlushCache(void);
   virtual nsImageType GetImageType(const char *buf, PRInt32 length);
 
 private:
@@ -98,6 +99,13 @@ ImageManagerImpl::ShrinkCache(void)
 {
   return IL_ShrinkCache();
 }
+
+NS_IMETHODIMP
+ImageManagerImpl::FlushCache(void)
+{
+  IL_FlushCache();
+  return NS_OK;
+}
  
 nsImageType 
 ImageManagerImpl::GetImageType(const char *buf, PRInt32 length)