I'm somewhat new in web development. At the moment I'm creating a couple of views. In the example I'm supposed to base my view on I have the following code:

Code:
<ul class="sub-menu @(Html.IsActiveItem("Reporting", "blabla") || (Html.IsActiveItem ("ReportingSavings" , "blabla" )) ? "in" : "collapse" )" id="reports">

I was wondering what it does?