Swf and php problem

Hi. I’m relatively new to Actionscripting and i can’t seem to figure this out.
We’ve developed a small app that allows users to check messages sent to them when they log in.

i recently updated the navbar to be a flash navbar, whose buttons call the appropriate html pages. the problem i am having is that i need the flash navbar to display the name of the person who is logged in.

i created a dynamic text field, gave it the variable name “myVar”
do i need an instance name for it as well??
turned it into a symbol (movie) and dropped this code in:

onClipEvent (load) {
loadVariables(“http://website.net/website/welcomeName.php”, this, “GET”);
}

the corresponding php file is named “welcomeName.php” and looks like this:

<?php header( “Content-type: application/x-www-urlform-encoded”); $user_name =“blah”; print “myVar=” . urlencode($user_name);

i can’t get this to work. the whole app is a php based thing, running on a php server.
the funny thing is, this was working on an older version of flashplayer, but not in version 7.
what am i doing wrong?
is there a different way to do this?

any help would be great.
thanks.
the_exiled.