+JS
    +JsField
    
    (gui '(+JS +Button) "@img/mapicon.gif" "@img/no.png"
       '(set> (: home map) (path> (: home obj) 40)) )
    ...
    (<p> '((id . map) (style . "width: 600px; height: 400px"))
       (gui 'map '(+JsField) "showMap") )