My HTTPService help needed

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:ns1="*">
	<mx:states>
		<mx:State name="Logged In">
			<mx:SetProperty target="{panel1}" name="height" value="95%"/>
			<mx:SetProperty target="{panel1}" name="title" value="Members Section"/>
			<mx:SetProperty target="{panel1}" name="width" value="95%"/>
			<mx:RemoveChild target="{Submit}"/>
			<mx:RemoveChild target="{label1}"/>
			<mx:RemoveChild target="{label2}"/>
			<mx:RemoveChild target="{password}"/>
			<mx:RemoveChild target="{username}"/>
			<mx:RemoveChild target="{register_send}"/>
			<mx:RemoveChild target="{register_page}"/>
		</mx:State>
		<mx:State name="register">
			<mx:RemoveChild target="{username}"/>
			<mx:RemoveChild target="{password}"/>
			<mx:RemoveChild target="{Submit}"/>
			<mx:RemoveChild target="{register_page}"/>
			<mx:RemoveChild target="{panel1}"/>
			<mx:AddChild position="lastChild">
				<ns1:register x="451" y="253">
				</ns1:register>
			</mx:AddChild>
		</mx:State>
	</mx:states>
	<mx:Panel width="250" height="200" layout="absolute" title="Login System" horizontalCenter="20" verticalCenter="-10" id="panel1">
		<mx:TextInput x="10" y="37" id="username"/>
		<mx:TextInput horizontalCenter="-25" verticalCenter="24" id="password" displayAsPassword="true"/>
		<mx:Label x="10" y="10" text="Username:" id="label2"/>
		<mx:Label x="10" y="67" text="Password:" id="label1"/>
		<mx:Button x="10" y="123" label="Submit" id="Submit" click="login_user.send(); "/>
		<mx:Button x="105" y="123" label="Register:" id="register_page" click="currentState='register'"/>
	</mx:Panel>
<mx:HTTPService id="login_user" result="checkLogin(event)" method="POST" url="http://www.2ss-dr.com/flex/login.php" useProxy="false">

<mx:request xmlns="">

<username>{username.text}</username>

<password>{password.text}</password>

</mx:request>

</mx:HTTPService>
	
<mx:Script>

<![CDATA[
	import mx.rpc.events.ResultEvent;

private function checkLogin(evt:ResultEvent):void

{

	if(evt.result.loginsuccess == "yes")

	{

	currentState = "Logged In";

	}

	if(evt.result.loginsuccess == "no")

	{

		mx.controls.Alert.show("Invalid username/password");

	}		

}

]]>

</mx:Script>

	
</mx:Application>

<?xml version="1.0" encoding="utf-8"?>
<mx:Module xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="400" height="300">


<mx:HTTPService id="register_user" method="POST" url="http://www.2ss-dr.com/flex/register.php" useProxy="false">

<user>{user.text}</user>

<pass>{pass.text}</pass>

</mx:HTTPService>
	<mx:Panel x="0" y="0" width="400" height="300" layout="absolute" title="Register" id="user_register">
		<mx:Label x="10" y="28" text="Username:" id="user_label"/>
		<mx:TextInput x="10" y="54" id="user"/>
		<mx:TextInput x="10" y="110" id="pass" displayAsPassword="true"/>
		<mx:Button x="10" y="150" label="Register" id="register_button" click="register_user.send();"/>
		<mx:Label x="10" y="84" text="Password:" id="pass_label"/>
	</mx:Panel>
</mx:Module>