This is what Magix wrote:

*MAGIX web hosting only supports the delivery of static contents. Data, which must be interpreted in order to be correctly displayed (such as .php, .asp etc.) or has to be edited by programmers at the server end, is not supported (except for Java script). In these cases, data will be displayed or prepared via HTTP "as is". In addition, no databases are supported (MySQL, Access etc.)

Javascript has nothing to do with FTP. The webbrowser must support it.