Ok,
You have to put everything that’s in your body right now inside a new file login.html.
Your index.html should look more like this:
...
<body>
<ion-nav-view></ion-nav-view>
</body>
and then your login view and fhcentral view get automaticly injected inside the <ion-nav-view>.
You should take a look at this:
http://learn.ionicframework.com/formulas/navigation-and-routing-part-1/