function HttpRequestDo()
{
	var connection;
	if (window.XMLHttpRequest)
	{
			connection = new XMLHttpRequest();		
			if (connection.overrideMimeType)
			{
				connection.overrideMimeType('text/xml; charset=utf-8');
			}
	}
	else if (window.ActiveXObject)
	{
		try
		{
			connection = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			try
			{
				connection = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e) 
			{}
		}
	}
	if (!connection)
	{
		alert('Cannot create XMLHTTP instance');
		return false;
	}
	return connection
}
var HttpRequest;