Hi Max, I have: instance YesodJquery APPNAME where urlJqueryJs _ = Left $ StaticR js_jquery_1_4_4_min_js urlJqueryUiJs _ = Left $ StaticR js_jquery_ui_1_8_6_custom_min_js urlJqueryUiCss _ = Left $ StaticR css_jquery_ui_1_8_6_custom_css instance Yesod APPNAME where defaultLayout widget = do mmsg <- getMessage y <- getYesod pc <- widgetToPageContent $ do addWidget widget addScriptEither $ urlJqueryJs y addScriptEither $ urlJqueryUiJs y addStylesheetEither $ urlJqueryUiCss y !!! %html %head ^pageHead.pc^ ... This kind of system should fix your problems. This does seem like unnecessary boiler plate though. Greg Weber