if( typeof XMLHttpRequest == "undefined" )
	XMLHttpRequest = function()
		{
		return new ActiveXObject(
			navigator.userAgent.indexOf( "MSIE 5" ) >= 0 ?
			"Microsoft.XMLHTTP" : "Msxml2.XMLHTTP"
			);
		};


function serialize( data )
	{
	var ret = [];

	for( var item in data )
		ret.push( item + "=" + encodeURIComponent( data[ item ] ) );			

	return ret.join( "&" );
	}


function ajax( options )
	{
	options =
		{
		type: options.type || "GET",
		url: options.url || "",
		content: options.content || "",
		timeout: options.timeout || 10000,
		onComplete: options.onComplete || function(){},
		onError: options.onError || function(){},
		onSuccess: options.onSuccess || function(){},
		data: options.data || ""
		};

	var xml = new XMLHttpRequest();

	xml.open( options.type, options.url, true );

	if( options.type === "POST" )
		{
		xml.setRequestHeader( "Content-type", "application/x-www-form-urlencoded" );
		xml.setRequestHeader( "Content-length", options.content.length );
		xml.setRequestHeader( "Connection", "close" );
		}

	var timeoutLength = options.timeout;
	var requestDone   = false;

	setTimeout( function(){ requestDone = true; }, timeoutLength );

	function httpSuccess( r )
		{
		try
			{
			return ( ! r.status && location.protocol == "file:" ) ||
				( r.status >= 200 && r.status < 300 ) ||
				( r.status == 304 ) ||
				( navigator.userAgent.indexOf( "Safari" ) >= 0 && typeof r.status == "undefined" );					
			}
		catch( e ){}

		return false;
		}

	function httpData( r, type )
		{
		var ct   = r.getResponseHeader( "content-type" );
		var data = ! type && ct && ct.indexOf( "xml" ) >= 0;

		data = ( type == "xml" ) || data ? r.responseXML : r.responseText;

		if( type == "script" )
			eval.call( window, data );

		return data;
		}

	xml.onreadystatechange = function()
		{
		if( xml.readyState == 4 && ! requestDone )
			{
			if( httpSuccess( xml ) )
				options.onSuccess( httpData( xml, options.data ) );
			else
				options.onError();

			options.onComplete();

			xml = null;
			}
		};

	xml.send( options.content );
	}