You can try replacing the url as this, url:'/rest/user/create.json' - / befor...

You can try replacing the url as this, url:'/rest/user/create.json' - / before the url. Also to debug if the url is hit properly, or are there any other errors, you can install firebug, a firefox plugin, using which you can check for errors and debug your problem in the console by inspecting the element.