I'm trying to write an XMLHttpRequest using the POST method. I have managed to use XMLHttpRequest in the past using the GET method but am struggling with POST.

Here's my code:

var xmlhttp = null;

if (window.XMLHttpRequest)

{// code for IE7+, Firefox, Chrome, Opera, Safari

    xmlhttp = new XMLHttpRequest();

}

else

{// code for IE6, IE5

    xmlhttp = new ActiveXObject(Microsoft.XMLHTTP);

}



var url = http://www.mysite.com/script.php;

var params = var=1;

xmlhttp.open(POST, url, true);

xmlhttp.send(params);

It basically calls a PHP script which then adds some information to a database.