function createXMLHttpRequest(){
        http_request = false;
		//XMLHttpRequest
		if(window.XMLHttpRequest) { //Mozilla 
			http_request = new XMLHttpRequest();
			if (http_request.overrideMimeType) {//MiME
				http_request.overrideMimeType('text/xml');
			}
		}
		else if (window.ActiveXObject) { // IE
			try {
				http_request = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
				try {
					http_request = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e) {}
			}
		}
		return http_request;
}