var http_request = false;

function MakeRequest(url, callback_function)
{
	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('Cannot create XMLHTTP instance');
		return false;
	}
	http_request.onreadystatechange = function() 
	{
		if (http_request.readyState == 4)
		{
			if (http_request.status == 200)
			{
				eval(callback_function + '(http_request.responseText)');
			}
			else
				alert('There was a problem with the request.(Code: ' + http_request.status + ')');
		}
	}
	
	http_request.open('GET', url, true);
	http_request.send(null);
}