MasterSlider hide first/llast navigation

event.js

function(event){
	var api = event.target;
	var total_slides=api.count();
	var current_slide = api.index();
	
	if(current_slide == total_slides-1){
		jQuery('.ms-nav-next').addClass('forward-hidden').removeClass('ms-nav-next');
	}
	else{
		jQuery('.forward-hidden').addClass('ms-nav-next').removeClass('forward-hidden');
	}
	
	if(current_slide == 0){
		jQuery('.ms-nav-prev').addClass('prev-hidden').removeClass('ms-nav-prev');
	}
	else{
		jQuery('.prev-hidden').addClass('ms-nav-prev').removeClass('prev-hidden');
	}
}