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var ajaxGlobal=null;
if(ajaxGlobal && ajaxGlobal.readyState!=4)
{
	ajaxGlobal.abort();
}

ajaxGlobal=$.ajax(...

/*
0: request not initialized
1: server connection established
2: request received
3: processing request
4: request finished and response is ready
status 200: "OK"
404: Page not found
*/