ajax.fifo = [];
ajax.call ( req_url, req_body, req_timeout, call_extras, resp_ok_func, resp_fail_func )
{
	// build up an object containing everything you'd ever want to know about this ajax call
	var call =
	{
		'req_url' : req_url;
		'req_body' : req_body;
		'req_timeout' : req_timeout;
		'call_extras' : call_extras;
		'resp_ok_func' : resp_ok_func;
		'resp_fail_func' : resp_fail_func;
		'resp_http_nbr' : null;
		'resp_http_body' : null;
	} ;
	// put this call on the ajax fifo
	ajax.fifo.push( call );
	// set up a callback for the ajax implementation, the developer never sees this
	var inner_resp_func = function(resp_http_nbr, resp_http_body)
	{
		call.resp_http_nbr = resp_http_nbr;
		call.resp_http_body = resp_http_body;
		ajax.handle();
	}
	// make the call
	{ajax implementation}.( req_url, req_body, req_timeout, inner_resp_func );
}
ajax.handle()
{
	if ( ajax.fifo.length > 0
		&& ajax.fifo[0].resp_http_nbr != null)
	{
		var call = ajax.fifo.shift();
		if ( call.resp_num == 200 )
		{
			call.resp_ok_func( job );
		}
		else
		{
			call.resp_fail_func( job );
		}
		setTimeout('ajax.handle();', 10);
	}
}