(function($) {
	$(document).bind("ready", function() {
		var thread;
		var scrolled = $("#exibicao_pagina");
		
		var trueHeight = 0;
		$.each($("#exibicao_pagina").children(), function() {
			trueHeight += this.offsetHeight;
		});
		
		if (trueHeight > scrolled.height()) {
			$("#arrow-up")
				.bind("mouseover", function() {
					thread = window.setInterval(function() {
						if (scrolled.get(0).scrollTop - 5 > 0)
							scrolled.get(0).scrollTop -= 5;
					}, 50);
				})
				.bind("click", function() {
					if (scrolled.get(0).scrollTop - 30 > 0)
						scrolled.get(0).scrollTop -= 30;
				});
			$("#arrow-down")
				.bind("mouseover", function() {
					thread = window.setInterval(function() {
						if (scrolled.get(0).scrollTop + 5 < scrolled.get(0).scrollHeight)
							scrolled.get(0).scrollTop += 5;
					}, 50);
				})
				.bind("click", function() {
					if (scrolled.get(0).scrollTop + 30 < scrolled.get(0).scrollHeight)
						scrolled.get(0).scrollTop += 30;
				});
			$("#arrow-up, #arrow-down").bind("mouseout", function() {
				clearTimeout(thread);
			});
		} else {
			$("controles").hide();
		}
	});
})(jQuery);