XMLHTTPREQUEST READYSTATE

0	UNSENT				//Client has been created. open() not called yet.
1	OPENED				//open() has been called.
2	HEADERS_RECEIVED 	//send() has been called, and headers and status are available.
3	LOADING				//Downloading; responseText holds partial data.
4	DONE				//The operation is complete.
Ivan Cuaco