var req;

function navigate(page, subpage) {	
	var url = "ajax.php?id="+page+"&id2="+subpage;
	if(window.XMLHttpRequest) {
		req = new XMLHttpRequest();
	} else if(window.ActiveXObject) {
		req = new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	req.open("GET", url, true);
	req.onreadystatechange = callback;
	req.send(null);
}

function callback() {	
	if(req.readyState == 4) {
		var response = req.responseText;		
		//var resp = response.getElementsByTagName("response");
		getObject("offer_col_right").innerHTML = response;		
	}
	if(req.readyState == 1 || req.readyState == 0)
	  getObject("offer_col_right").innerHTML = '<p class="paragraph_short">Ładowanie danych...</p>';	  

  if(req.readyState != 1 && req.readyState != 0 && req.readyState != 4)
	    getObject("offer_col_right").innerHTML = '<p class="paragraph_short"></p>';
}

function getObject(obj) {
	var o;
	if(document.getElementById) o = document.getElementById(obj);
	else if(document.all) o = document.all.obj;	
	return o;	
}