var http_request=false;

function makeHttpRequest(post_get, asynchron, url, callback_function, return_xml)
{
	var http_request = false;

	if (window.XMLHttpRequest) { // Mozilla, Safari,...
	   http_request = new XMLHttpRequest();
	   if (http_request.overrideMimeType) {
	      http_request.overrideMimeType('text/xml');
	   }
	} 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('Unfortunatelly you browser doesn\'t support this feature.');
	   return false;
	}

	http_request.onreadystatechange = function() {
	   if (http_request.readyState == 4) {
	   	if (http_request.status == 200) {
				if (callback_function.length) {
	   	     	if (return_xml) {
	   	     	   eval(callback_function + '(http_request.responseXML)');
	   	     	} else {
	   	     	   eval(callback_function + '(http_request.responseText)');
	   	     	}
				}
	   	} else {
	   	   alert('There was a problem with the request.(Code: ' + http_request.statusText + ')');
	   	}
	   }
	}
	http_request.open(post_get, url, asynchron);
	http_request.send(null);
}