function centerListInvite() {
	var home_ball = document.getElementById("home");
	var invite = document.getElementById("listInvite");
	var ball_offset = home_ball.offsetLeft + home_ball.offsetParent.offsetLeft;
	var ball_width = home_ball.offsetWidth;
	var invite_width = invite.offsetWidth;
	var x_center = ball_offset + ball_width/2;
	var invite_offset = x_center - invite_width/2;
	invite.style.left = invite_offset;
}