//ajax request function and tools

function createRequest()
{
	var request;
	try
	{
		request = new XMLHttpRequest();
	}
	catch (trymicrosoft)
	{
		try
		{
			request = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (othermicrosoft)
		{
			try
			{
				request = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (failed)
			{
				request = null;
			}
		}
	}
	return request;
}