$headers = 'From: ' . $_POST['nombre'];

$headers  = "From: $from\r\n";
$headers .= "Content-type: text/html\r\n";

// Lets create a function
function sendEmail():Void
{
	// lets create the object to store the data to be sent.
	var sendData = new LoadVars();
	// ok now lets fill this object with the actual data
	// in order to do this you simply add a dot and the name you will use 
	// in the POST index. For example sendData.Message = "abc" you will be able to catch
	// the value in PHP like echo $_POST['Message']; that will output: abc
	sendData.Name = _root.form.Name.text;
	sendData.Message = _root.form.Message.text;
	// so on...  add as much elements as the fields you what to send.
	// ok now we need the object to store the data PHP will give you back
	var getData = new LoadVars();
	// ok now we have data to send and an object to store the reply.
	// lets see the sendAndLoad method:
	// this method requires 3 parameters in the order URL, TargetObject, Method
	// URL is the name and path of the PHP file you're calling for example "include/form.php"
	// or simply form.php if the PHP file is in the sabe directory of the flash movie
	// targetObject is the object that will hold the reply data in our case the getData var we created
	// Method is the method to be used to send the data so in this case it will be POST
	sendData.sendAndLoad("url.php", getData, "POST");
	// ok so we collected the data and have send it to PHP now we need the reply
	// so lets use the eventListenner that we have in LoadVars called onLoad and 
	// make something with that data.
	getData.onLoad = function(success:Boolean){
		// ok function is created, but see that i require a boolean value
		// in order to know if the flash loaded some Data, if so we will process that data
		// otherwise store a message in a msg var
		if(success){
			// ok by this point we have data to show, now lets see if we got errors
			// if we do we add the errors to a var so we can deal with it later if we don't,
			// we will store the message returned by PHP into an msg var.
			if(getData.Errors){
				// store the error on a variable
				var error = getData.Errors;
				// call a function that will deal with your error, and pass the error var as a parameter
				_root.dealWithError(error);
			}else{
				//store the message in a msg var
				msg = getData.Msg;
				// tell root to go to the next frame
				_root.nextFrame();
			}
		}else{
			// store the connection error in a msg
			msg = "Connection error: unable to contact the server";
			// tell root to go to the next frame
			_root.nextFrame();
		}
	}	
}

<?php
 echo "&msg= your message";
?>

<?php
 echo "&error= your error message";
?>