php not reading data correctly from flash

I have been pulling my hair out for 3 days, and there isn't much left to pull out. I have posted in practically every forum under the sun and no one can help me out.
Here is my problem:
I have a website done in php. There is a header.php, index.php, and footer.php. The navigation(flash menu) is in the header.php.
The index.php has this following code in it:
<?php
if ($c != "")
{
include("main_content_".$c.".php");
}
else
{
include("main_content_1.php");
}
?>

index.php loads whatever page according to what the variable is. If I click on the news button then 'c' in index.php would be set to 3 and index would open up main_content_3.php. The header and footer is the same throughout the site.

With the old menu everything worked fine. I would click on the text menu and I would be sent to the page I needed to go.
Now for the flash code(code snippet from one of the buttons):

onClipEvent (mouseUp)
{
getURL("index.php?c=2", "POST");
}

I can't get it to open it up in the same page. I have tried putting
getURL("index.php?c=2", "_top", "POST");
to self, parent, blank etc...
It works perfectly fine if it opens up in a blank(new) window, but trying to open it up in the same window is like trying to make a pig fly.

In the php script I have added $_GET[c]; and
$HTTP_GET_VARS[$c]; etc..., but nothing works.

I would greatly appreciate any help!

try using loadVars

is

var t = new LoadVars();
t.c = 3
t.send("index.php", "POST");

with this also change

$_GET[c]

to

$_POST["c"]

Thanks for the help! This seems to work. Can't believe that is all that it was.