I've changed code in a couple of methods, where the code within a method generating javascript output has changed from: id printString to: id greaseString The problem arises as the string is no longer surrounded by single quote marks, resulting incorrect javascript. The methods effected are: Pier-EditorEnh PRChangeCommand>>updateRoot Pier-Documents PRDocumentWidget>>renderEditOn: My initial fix was to simply add the single double quote as: PRDocumentWidget >>renderEditOn: html "Pier on Seaside 2.8" | id | self halt. html textArea value: self text; class: 'wiki-inline'; id: (id := html nextId); callback: [ :value | self text: value ]; onKeyUp: 'pier_document_widget_update(' , id printString , ')'. self session addLoadScript: 'pier_document_widget_register(' , id printString , ')' becomes: renderEditOn: html "Pier on Seaside 3.0" | id | self halt. html textArea value: self text; class: 'wiki-inline'; id: (id := html nextId); callback: [ :value | self text: value ]; onKeyUp: 'pier_document_widget_update(''' , id greaseString , ''')'. html document addLoadScript: 'pier_document_widget_register(''' , id greaseString , ''')' However examining the code which executes when printString is called I noticed that it also escapes any quote marks in the string passed. On reflection I found the method asJavascript which appears to do the right thing. I've removed my extra speech marks, changed greaseString to asJavascript, and tested and all appears functional again. Have I found the right method?