Cause: Only in IE9 seems that when using innerHTML method, it evaluates the scripts found in the html code to insert, this behavior not happens in other IE versions (8, 10,11) neither Chrome/Safari. So all the script tags inserted in the ajax refreshed portlet, in IE9, are executed twice: once when using innerHTML (attach the http response to a DOM element) and further when adding the new DOM element into the existing DOM tree (appendChild). Consequence: Both setAjax and refreshPanel javascript functions were called twice, producing some unexpected errors. Fix: Control that both setAjax and refreshPanel javascript functions are only executed once per ajax request. Result: As functions are called just once,no unexpected results appear.