function hide(classname) {
	$('.'+classname).hide();
}

function show_hide(classname) {
	$('.'+classname).slideToggle(150);
}

function update_string_lenght(sourceclass, destinationclass, limit) {
	if($('.'+sourceclass).val().length > limit)
		$('.'+destinationclass).html("<span class='red'>Treść może zawierać najwięcej "+limit+" znaków, a teraz ma ich "+$('.'+sourceclass).val().length+".</span>");
	else
		$('.'+destinationclass).html("Znaków: "+$('.'+sourceclass).val().length+" / 160");
}