function openAjax() {

	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		ajaxX = new XMLHttpRequest();
		if (ajaxX.overrideMimeType) {
			ajaxX.overrideMimeType('text/xml');
		}
	} 
	else if (window.ActiveXObject) { // IE
		
		try {
			ajaxX = new ActiveXObject("Msxml2.XMLHTTP");
		} 
		catch (e) {
			try {
				ajaxX = new ActiveXObject("Microsoft.XMLHTTP");
			} 
			catch (e) {}
		}
	}

	return ajaxX;
}