var http_request = false;
function makeRequest(url, parameters, container) {
	http_request = false;
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			// set type accordingly to anticipated content type
			//http_request.overrideMimeType('text/xml');
			http_request.overrideMimeType('text/html');
		}
	} else if (window.ActiveXObject) { // IE
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {
			}
		}
	}
	if (!http_request) {
		alert('Cannot create XMLHTTP instance');
		return false;
	}
	http_request.onreadystatechange = function() { alertContents(container); };
	http_request.open('GET', url + parameters, true);
	http_request.send(null);
}

function alertContents(container) {
	if (http_request.readyState == 4) {
		if (http_request.status == 200) {
			//alert(http_request.responseText);
			result = http_request.responseText;
			
			//var newdiv = document.createElement("div");
			//newdiv.innerHTML = result;
			//var container = document.getElementById("sub_cat");
			//container.appendChild(newdiv);
			
			document.getElementById(container).innerHTML = result;
		} else {
			alert('There was a problem with an AJAX request.');
		}
	}
}

function get(obj, url, container) {
	var getstr = "?";
	for (i=0; i<obj.childNodes.length; i++) {
		if (obj.childNodes[i].tagName == "INPUT") {
			if (obj.childNodes[i].type == "text") {
			   getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";
			}
			if (obj.childNodes[i].type == "checkbox") {
				if (obj.childNodes[i].checked) {
				  getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";
				} else {
				  getstr += obj.childNodes[i].name + "=&";
				}
			}
			if (obj.childNodes[i].type == "radio") {
			   if (obj.childNodes[i].checked) {
				  getstr += obj.childNodes[i].name + "=" + obj.childNodes[i].value + "&";
			   }
			}
		}
		if (obj.childNodes[i].tagName == "SELECT") {
			var sel = obj.childNodes[i];
			getstr += sel.name + "=" + sel.options[sel.selectedIndex].value + "&";
		}
	}
	makeRequest(url, getstr, container);
}