function get_xml_http (){

		var xml_http = null;

		try {
			xml_http = new XMLHttpRequest ();
		}
		catch (e){
			try {
				xml_http = new ActiveXObject ('Msxml2.XMLHTTP')
			}
			catch (e){
				xml_http = new ActiveXObject ('Microsoft.XMLHTTP');
			}
		}

		return xml_http;

	}