function sendRequest( url, callback, postData ) {
	var req = createXMLHTTPObject( );
	if ( !req ) return;

	var method = ( postData ) ? "POST" : "GET";
	req.open( method, url, true );
	req.setRequestHeader( 'User-Agent', 'XMLHTTP/1.0' );

	if ( postData )
		req.setRequestHeader( 'Content-Type', 'text/xml' );

	req.onreadystatechange = function ( ) {
		if ( req.readyState != 4 ) return;

		if ( req.status != 0 && req.status != 200 && req.status != 304 ) {
			return;
		}

		callback( req );
	}

	if ( req.readyState == 4 ) return;
	req.send( postData );
}

var XMLHttpFactories = [
	function ( ) { return new XMLHttpRequest( )},
	function ( ) { return new ActiveXObject( "Msxml2.XMLHTTP" ) },
	function ( ) { return new ActiveXObject( "Msxml3.XMLHTTP" ) },
	function ( ) { return new ActiveXObject( "Microsoft.XMLHTTP" ) }
];

function createXMLHTTPObject( ) {
	var xmlhttp = false;
	for ( var i=0; i<XMLHttpFactories.length; i++ ) {
		try {
			xmlhttp = XMLHttpFactories[ i ]( );
		}

		catch ( e ) {
			continue;
		}

		break;
	}

	return xmlhttp;
}