function birthdayeffect(m, d) {
	let today = new Date();
	if (m != today.getMonth()+1 || d != today.getDate()) return;
	let speed = 3+$(window).height() * 0.007;
	// console.log(speed);
	const balloon = 20;
	let html = '<div id="birthday">';
	for (let i = 0; i < balloon; i++) {
		html += '<div class="birth-balloon" style="'
		html += 'background-image: url(../balloon0'+(i%4+1)+'.png);';
		html += 'height: '+ parseInt(400-Math.random()*100) +'px;';
		html += 'left: '+ parseInt(Math.random()*99) +'%;';
		html += 'animation-delay: '+ Math.random()*8 +'s;';
		html += 'animation-duration: '+ (speed+Math.random()*3) +'s;';
		html += '"></div>';
	}
	html += '<div id="happybirthday"></div>';
	html += '</div>';
	$('body').append(html)
	setTimeout(function() {
		$('.birth-balloon').animate({'opacity': 0}, 3000);
		$('#happybirthday').css('transition', 'all 1s');
		setTimeout(function() {
			$('#happybirthday').css('opacity', 0);
			setTimeout(function() {
				$('#birthday').css('display', 'none');
			}, 1500);
		}, 1500);
	}, 9000);
	setTimeout(function() {
		$('#happybirthday').css({
			'opacity': 1,
			'transform': 'scale(1)'
		});
	}, 6000);
}