function PPSCXHRLibCallArg(url, jsonStrOrJsObj, requestHandler, async, message)
{
	this.url = url;
	this.jsonStrOrJsObj = jsonStrOrJsObj;	// is either a JS object which will be stringified, or it's already a JSON string.
	this.requestHandler = requestHandler;
	this.async = async;
	this.message = message;
	this.data = {};
	this.floater = null;
	
	// gets a new XHR object with which to make the call.
	this.xmlhttp = PPSCXHRLib.getXmlHttpRequestObject();
}