Password help

[iimp]

Hey,

I am using VB 3.8 and am trying to validate the password through an external app. Here is the PHP code I have

	$username = isset($_GET[$usernameLabel]) ? ($_GET[$usernameLabel]) : "";
	$password = isset($_GET[$passwordLabel]) ? ($_GET[$passwordLabel]) : "";
	$userid = isset($_GET[$useridLabel]) ? $_GET[$useridLabel] : "";
	$script = isset($_GET[$scriptLabel]) ? ($_GET[$scriptLabel]) : "";

	$action = isset($_GET[$actionLabel]) ? $_GET[$actionLabel] : "";
	
	switch($action){
	case $actionLoginLabel:	
		$userid = -1;
		$res = mysql_query("select `userid`,`username`,`password`,`salt` from `user` where 1",$sql_con);
		while($row = mysql_fetch_array($res,MYSQL_ASSOC)){	
			if($row["password"] == md5(md5($password).$row["salt"]) && strtolower($row["username"]) == strtolower($username)){
				$userid = $row["userid"];
				break;
			}
		}
		//echo(enc($userid));
		echo($userid);
		break;

and here is the java

		private void loginButton_event(ActionEvent e) {
			char[] p_raw = passwordTextBox.getPassword();
			String p = "";
			for(char c : p_raw){
				p = p + Character.toString(c);
			}
			
			try {
				userid = Integer.parseInt(getPage(DOMAIN+"?"+LABEL_ACTION+"="+LABEL_ACTION_LOGIN+"&"+LABEL_USERNAME+"="+usernameTextBox.getText()+"&"+LABEL_PASSWORD+"="+p));
			} catch(NumberFormatException err){}
			
			if(userid > -1){
				username = usernameTextBox.getText();
				password = p;
				
				setVisible(false);
			} else {
				JOptionPane.showMessageDialog(this,"Incorrect login details!","Error!",JOptionPane.ERROR_MESSAGE);
			}
		}

It always shows as Incorrect login but I am using the right login/pass, can anyone help fix this please?