function check_username()
{
	var username = $('#name').val();
	if (username)
	{
		$.getJSON('register.html', {action: 'check', name: username}, function(json)
		{
			document.getElementById('username_notif').className=json['class'];
			document.getElementById('username_notif').innerHTML=json['message'];
			$('#username_notif').show();
		})
	}
}

function name_change()
{
	if (document.getElementById('name').value.length > 0)
		document.getElementById('check_name').disabled=false;
	else
		document.getElementById('check_name').disabled=true;
}

name_change();