<button>Toggle 'em</button> <p>Hiya</p> <p>Such interesting text, eh?</p>
$("button").click(function () {
$("p").toggle(2000);
});
<button>Toggle</button> <p>Hello</p> <p style="display: none">Good Bye</p>
$("button").click(function () {
$("p").toggle("slow");
});