function isuser()
{
	x_isuser(document.getElementById("username").value, show_isuser);
}
function isemail()
{
	x_isemail(document.getElementById("email").value, show_isemail);
}
function show_isuser(data)
{
	document.getElementById("isuser").innerHTML = data;
}
function show_isemail(data)
{
	document.getElementById("isemail").innerHTML = data;
}
function check_form()
{
	if (document.getElementById("agb").checked == false)
	{
		alert("Bitte akzeptiere die AGBs und Datenschutzrichtlinien.");
		return false;
	}
	else
	{
		return true;
	}
}
function newcaptcha()
{
	var img = new Image();
	img.src = "/captcha?"+Math.floor(Math.random() * 9999);
	document.images["captcha_img"].src = img.src;
}