LoadVars - communication with a server

Hi All,
I'm really newbie of Flash Lite, but i did something with Flash in the past. So If I said something completely wrong, be patient... :o
I would like to exchange data with a server. My mobile should take the path of an image. It sends some data (var1, var2) to a php server and the server answers with a string that is a path.
I implemented this with the following code:

[CODE]on(release){
var envelope:LoadVars = new LoadVars();
var envelope_rcv:LoadVars = new LoadVars();
envelope.val1 = '41.5';
envelope.val2 = '12.3';
envelope.sendAndLoad("http://www.mywebsite.com/try.php",envelope_rcv,"GET");
_root.text1 = envelope_rcv.path;
}[/CODE]

_root.text1 is undefined after I press the button. :(
Is there any error according to you?
How would you deliver that issue?
Thank you

Hi,

The written code does not give sufficient time for sending the data across the network and receiving the result.

[CODE]
envelope.sendAndLoad("http://www.mywebsite.com/try.php",envelope_rcv,"GET");
_root.text1 = envelope_rcv.path;[/CODE]

You can rewrite this piece of code using the [I]"onLoad"[/I] event handler. This handler is invoked after the implementation of [I]sendAndLoad[/I]. Moreover, it is not necessary to have 2 [I]LoadVars[/I] instances.

[CODE]
url = "http://www.mywebsite.com/try.php";
var envelope:LoadVars = new LoadVars();
envelope.val1 = '41.5';
envelope.val2 = '12.3';
envelope.sendAndLoad(url,envelope,"POST");

envelope.onLoad = function(success){
//assuming path is the result returned from php
_root.text1 = this.path;
}
[/CODE]