String manipulation

basic replace. (replacement stop once matched is found)

        currentPopupId = currentPopupId.replace('.htm', '');

replace using regular expression:

popupContent = popupContent.replace(/id=discuss_(.*?)input(.*?)<\/textarea>/ig, 'id=discuss_$1input$2
');

replace using split and join:

        popupContent = popupContent.split("\\'").join("'");