function InitAjax() 
{
	var http_request = false;

	if (window.XMLHttpRequest)
	{
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) 
		{
			http_request.overrideMimeType('text/xml');
		}
	} 
	else if (window.ActiveXObject)
	{
		try 
		{
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			try 
			{
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} 
			catch (e)
			{}
		}
	}
	if (!http_request)
	{
		alert('Giving up :( Cannot create an XMLHTTP instance');
		return false;
	}
	return http_request;
}