function is_checked()
{
	var license = document.getElementById('license').checked;
	var refund = document.getElementById('refund').checked;
	
	if (license && refund)
	{
		document.getElementById('purchase').disabled=false;
	}
	else
	{
		document.getElementById('purchase').disabled=true;
	}
}

if (document.getElementById('license').checked && document.getElementById('refund').checked)
{
	document.getElementById('purchase').disabled=false;
}

function is_registered(id)
{
	if ('login' == id)
	{
		$('#login').show();
		document.getElementById('register').style.display='none';
	}
	else
	{
		$('#register').show();
		document.getElementById('login').style.display='none';
	}
}

function check_username()
{
	username = document.getElementById('name').value;
	if (username.length > 0)
	{
		request('/get_username.php?username=' + username, get_fields_success, get_fields_failure)
	}
}

function get_fields_success()
{
	var item = xmlhttp.responseXML.getElementsByTagName('item');
	var correct = item[0].childNodes[0].nodeValue;
	
	$('#username_notif').show();
	
	if (correct > 0)
	{
		document.getElementById('username_notif').className='error';
		document.getElementById('username_notif').innerHTML='Username already taken. Please try another one.';
	}
	else
	{
		document.getElementById('username_notif').className='notif';
		document.getElementById('username_notif').innerHTML='Username has not been taken. You may register using it.';
	}
}

function get_fields_failure()
{
}

function name_change()
{
	if (document.getElementById('name').value.length > 0)
		document.getElementById('check_name').src="/img/btn-check.gif";
	else
		document.getElementById('check_name').src="/img/btn-check-dis.gif";
}

name_change();