i got a new host, they enabled mysqli for me after i asked them now i get errors? i can connect but not query or is something wrong with my code?

I get this error

Fatal error: Call to undefined function: mysqli_query() in /home/sites/wow-manager.co.cc/public_html/includes/class/userAuth.php on line 19

when i run this script

<?php

class userAuth {
		var $cxn; //Connection String
		var $user; //Username String
		var $pass; //Password String

function login(){
	$sql="SELECT * FROM `users` WHERE `username`='".$this->user."' AND `password`='".$this->pass."'";
	$result = mysqli_query($this->cxn, $sql);
	if(mysqli_num_rows($result)){
		return true;
	}else{	return false;	}
}
function fpass(){
	$sql="SELECT * FROM `users` WHERE `username`='".$this->user."'";
	$result = @mysqli_query($this->cxn, $sql);
	if(@mysqli_num_rows($result)){
		$row = @mysqli_fetch_assoc($result);
		$subject = "Forgotten Password, WoWAccount Management.";
		$msg = "
		Dear ".$this->user." \n
		Your username is: ".$row['username']." \n
		Your passowrd is: ".$row['password']." \n

		Please login at http://wow-manager.co.cc
		";
		if(@mail($row['email'], "Subject: $subject", $msg, "From: support@wow-manager.co.cc" )){
		return true;
		}else{return false;}
	}else{	return false;	}
}	
function logout(){
	session_destroy();
	session_unset();
	return true;
}

}

$userAuth = new userAuth;

?>

Thanks in advanced

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