PHP and AJAX

I  have this code that sends some information to a php page that searches a
database and returns the results. The code is:

//showCustomer.js
...
  
var url="showCustomer.php?flag="+flag
url=url+"&initial="+str
url=url+"&customer_radio="+customer_radio
url=url+"&is_prospect="+is_prospect

xmlHttp.onreadystatechange=stateChanged 
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
...

//The php page(showCustomer.php)
...
$initial = $_GET['initial'];
...
$show_customer_query = mysql_query("SELECT * FROM customer WHERE
customer_name LIKE '$initial%' ORDER BY customer_name");
...

In Firefox works perfect both with english and greek.
But when it comes to IE6 and 7 it works only with english. The $initial var
is not passed to showCustomer.php properly,so the query fails. If I pass a
letter α(like a) or σ(like s), $initial is something like this � or a
square.This happens with all the greek letters.What is the problem?I don't
mind working only with Firefox(I am working only with it), but what about
the other users?...
Everything is UTF8. And the problem appears when I send through GET the
parameters.

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