function getKey(length){
	
	var chars = ["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"]
	var key = ""
	for (var i=0; i<length; i++){
		var r = Math.floor(Math.random() * chars.length );
		
		key += chars[r];
	};
	return key;
};