function f_show_hide (content_id){	     
  //$('#'+content_id).slideToggle('slow');   
  
  if($('#'+content_id).is(":visible")){
	 $('#'+content_id).hide();
	 $('#wrapper_headlines').show(); 
  } else {
	 $('#'+content_id).show();
	 $('#wrapper_headlines').hide();
  } 
   
}

/* Toggle between adding and removing the "responsive" class to topnav when the user clicks on the icon */

function f_menu() {
    var x = document.getElementById("myTopnav");
    if (x.className === "topnav") {
        x.className += " responsive";
		document.getElementById("logo_wrapper").style.display = 'none';
	    document.getElementById("login_button_wrapper").style.display = 'none';
		$("#icon").text('X');		
		$("#icon").addClass('icon_white');
    } else {
        x.className = "topnav";
		document.getElementById("logo_wrapper").style.display = 'block';
	    document.getElementById("login_button_wrapper").style.display = 'block';
		$("#icon").text('☰');
		$("#icon").addClass('icon');
		$("#icon").removeClass('icon_white');
    }
	
}