[Solved] How to use this piece of code in a function

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Your vis() function is binding an event handler when it’s passed one, otherwise returning the status. Thus:

vis(function(event) {   
  if ( vis() ) {
    // visible   
  } else { 
   // not visible  
  } 
});

Or more verbosely: 

var handler = function(){ 
  // calling vis() with no arguments will return a boolean
  if (vis()) {
    // visible
  } else {
    // not visible
  }
}

// if a handler is passed, it gets bound to the event
// thus, runs on *any* visibility state change
vis(handler);

solved How to use this piece of code in a function