Index: /CKEditor/trunk/_source/plugins/flash/dialogs/flash.js
===================================================================
--- /CKEditor/trunk/_source/plugins/flash/dialogs/flash.js	(revision 3319)
+++ /CKEditor/trunk/_source/plugins/flash/dialogs/flash.js	(revision 3320)
@@ -285,4 +285,11 @@
 				}
 			},
+			
+			onHide : function()
+			{
+				if ( this.preview )
+					this.preview.setHtml('');
+			},
+			
 			contents : [
 				{
@@ -316,12 +323,25 @@
 											onLoad : function()
 											{
-												var dialog = this.getDialog();
-												var previewElement = dialog.getContentElement( 'info', 'preview' ).getElement().getChild( 3 );
-												this.getInputElement().on( 'change', function()
-													{
-														previewElement.setHtml( '<embed height="100%" width="100%" src="'
-																+ CKEDITOR.tools.htmlEncode( this.getValue() )
-																+ '" type="application/x-shockwave-flash"></embed>' );
+												var dialog = this.getDialog(), 
+												updatePreview = function( src ){
+													
+													dialog.preview.setHtml( '<embed height="100%" width="100%" src="'
+														+ CKEDITOR.tools.htmlEncode( src )
+														+ '" type="application/x-shockwave-flash"></embed>' );
+												};
+												// Preview element
+												dialog.preview = dialog.getContentElement( 'info', 'preview' ).getElement().getChild( 3 );
+												
+												// Sync on inital value loaded.
+												this.on( 'change', function( evt ){
+													
+														if ( evt.data && evt.data.value )
+															updatePreview( evt.data.value );
 													} );
+												// Sync when input value changed.
+												this.getInputElement().on( 'change', function( evt ){
+													
+													updatePreview( this.getValue() );
+												}, this );
 											}
 										},