/**

 *	Zoki Poll js asynchronous functions

 *

 *	This file provides js functions that interacts with server

 *	and request data from server backend functions

 *

 *	Copyright (c) 2007, Zoki Soft <info@zokisoft.com>.

 * 

 *	This file is part of ZokiPoll.

 *	

 *	Zoki Poll is free software: you can redistribute it and/or modify

 *	it under the terms of the GNU Lesser General Public License as published by

 *	the Free Software Foundation, either version 3 of the License, or

 *	(at your option) any later version.

 *

 *	Zoki Poll is distributed in the hope that it will be useful,

 *	but WITHOUT ANY WARRANTY; without even the implied warranty of

 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *	GNU Lesser General Public License for more details.

 *

 *	You should have received a copy of the GNU Lesser General Public License

 *	along with Zoki Poll.  If not, see <http://www.gnu.org/licenses/>.

 *

 */



// asinc serwer query. Gets responce text and pass it to callback function

	function serverQuery( callback_function, url, responseType )

	{//alert('cb-> ' + callback_function + ' url-> ' + url);

		var XMLHttpRequestObject = false;

	    if( window.XMLHttpRequest )

	    {

			XMLHttpRequestObject = new XMLHttpRequest();

		}

		else if( window.ActiveXObject )

		{

			XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");

		}



		if( XMLHttpRequestObject )

	    {

			XMLHttpRequestObject.open( "GET", url );

//			XMLHttpRequestObject.open( "POST", url );

			XMLHttpRequestObject.onreadystatechange = function()

			{

				if ( XMLHttpRequestObject.readyState == 4 && XMLHttpRequestObject.status == 200 )

		    	{



					if ( '' != callback_function )

					{

						if ( 'xml' == responseType )

							answer = XMLHttpRequestObject.responseXML;

						else

							answer = XMLHttpRequestObject.responseText;



						callback_function(answer);

					}



					delete XMLHttpRequestObject;

					XMLHttpRequestObject = null;



				}

		    }

			XMLHttpRequestObject.send( null );

		}



		return true;

	}