I am using hosted JSAPI because our server is not Internet facing. I shall double check the URL's as suggested.
Many thanks,
Mark
<style type="text/css"> @import "<%=jsapiArcgisCssUrl%>"; @import "<%=cpath%>/static/jsapi.css"; @import "<%=jsapiArcgisUrl%>/js/esri/css/esri.css"; </style>