function check_handle(result) {
	if(result[0] == 'yes') {
		document.getElementById('not_available').style.display = 'none';
		document.getElementById('available').style.display = 'block';
	}
	else {
		document.getElementById('available').style.display = 'none';
		document.getElementById('not_available').style.display = 'block';
		var str = '<span class=descredsmaller1>The username is not available.<span><br />';
		for(i = 1; i < result[1]; i++) {
			str += "<input type=\"radio\" name=\"try\" onclick=\"switch_username('"+result[i+1]+"')\"/>" + result[i+1] + "<br />";
		}
		document.getElementById('not_available').innerHTML = str;
	}
}

function check_user_exist() {
	var username = document.getElementById('username').value;
	x_check_user_exist(username, check_handle);
}

function switch_username(username) {
	document.getElementById('username').value = username;
}