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var delayedActivity;							//	define variable
//	wait each time the user does something
//	run a function if user doesn't repeat action for a specific length of time
var delay = function(data, timeGap) {
	clearTimeout(delayedActivity);				//	delete previously started activity (if any)
	delayedActivity = setTimeout(function(data){	//	start new delayed acticity with new data
		//	do something here if user is idle
	}, timeGap);	//	ms to wait
};