Index: lams_tool_spreadsheet/web/includes/javascript/rsrcspreadsheetitem.js
===================================================================
RCS file: /usr/local/cvsroot/lams_tool_spreadsheet/web/includes/javascript/rsrcspreadsheetitem.js,v
diff -u -r1.1 -r1.2
--- lams_tool_spreadsheet/web/includes/javascript/rsrcspreadsheetitem.js	4 Jul 2008 07:40:26 -0000	1.1
+++ lams_tool_spreadsheet/web/includes/javascript/rsrcspreadsheetitem.js	23 Jul 2013 17:54:12 -0000	1.2
@@ -110,5 +110,8 @@
 		// then refresh "basic tab" spreadsheetlist and close this window.
 	}
 	function cancelSpreadsheetItem(){
-		window.top.hideMessage();
-	}
+		var win = window.hideMessage ? window : window.top;
+		if (win.hideMessage != null){
+			win.hideMessage();
+		}
+	}
\ No newline at end of file