function d_counter(){
    var download, a_download, a_download_disp;

    a_download      = 580;
    a_download_disp = 50;

    download = a_download + Math.floor(a_download_disp * Math.random());

	document.getElementById('download').innerText = download;

    window.setTimeout('d_counter()', Math.floor(10000 * Math.random()));
}

function u_counter(){
    var users, a_users, a_users_disp;

    a_users         = 1100;
    a_users_disp    = 100;

    users = a_users + Math.floor(a_users_disp * Math.random());

    document.getElementById('users').innerText = users;
	window.setTimeout('u_counter()', Math.floor(9000 * Math.random()));
}

d_counter();
u_counter();