function message_in_top(){
	var selected_cat=document.getElementById('id_category').selectedIndex;
	var id_cat = document.getElementById('id_category').options[selected_cat].value;
	var pay_serv=document.getElementById('payment_services').selectedIndex;
	if(pay_serv==2 || pay_serv==3){
		request=open_XMLHttpRequest();
		if (request){
			URL = "user_board_add.php";
			request.onreadystatechange = processStateChange;
			request.open("GET", URL+'?message=1&id_cat='+id_cat, true);
			request.send(null);
		}
	}else document.getElementById('show_pos_in_top').innerHTML="";
}

function open_XMLHttpRequest(){
	if (window.XMLHttpRequest){
		request = new XMLHttpRequest();
	} else if (window.ActiveXObject) {
			request = new ActiveXObject("Microsoft.XMLHTTP");
}
	return request;
}

function processStateChange(){
	if (request.readyState < 4) document.getElementById('show_pos_in_top').innerHTML = "Загрузка...";
	if (request.readyState == 4){
		if (request.status == 200){
			if(request.responseText!=1)
				document.getElementById('show_pos_in_top').innerHTML = request.responseText;
			else{
				document.getElementById('show_pos_in_top').innerHTML='<FONT color="red">Извините, но лимит объявлений «выше всех» в этой рубрике исчерпан</FONT>';
				document.getElementById('payment_services').selectedIndex=0;
			} 
			
		}else{
			document.getElementById('show_pos_in_top').innerHTML = "Error: Status "+request.status;
		}
	}
}