var ajaxRequest;
try {
	ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
} 
catch (e) {
	try {
		ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
	} catch (e) {
		ajaxRequest = false;
	}
}
if (!ajaxRequest && typeof XMLHttpRequest!='undefined') {
	try{
		ajaxRequest = new XMLHttpRequest();
	} catch (e) {
		ajaxRequest=false;
	}
}
if (!ajaxRequest && typeof XMLHttpRequest!='undefined') {
	alert ("Ошибка инициализации XMLhttpRequest!");
}
function get_joke(){
	ajaxRequest.open("POST", "jfunction.php", true);
	ajaxRequest.onreadystatechange=releaze;
	//ajaxRequest.setRequestHeader("Content-Type","text/html; charset=utf-8");
	ajaxRequest.send(null);
}
function releaze(){
	if (ajaxRequest.readyState==4){
		if (ajaxRequest.status==200){
			if(ajaxRequest.responseText !== null) { 					
				document.getElementById('jform').innerHTML=ajaxRequest.responseText;				
			}
		} 
		else if (ajaxRequest.status==404){
				document.getElementById('jform').innerHTML="404! Не найдено";
			}
	}	
}