Function parameters not passed

gistfile1.txt

var writeToCollection = function(collectionName, jsonObject){

	try{
		
		//the db name is hardcoded, 
		var collection = new mongo.Collection(db, collectionName);
		
		collection.insert(jsonObject, {safe:true}, function(err, objects) {
			if(err != null){
				sys.log("Could not write JSON in collection ->" + err);
			}
			if (err && err.message.indexOf('E11000 ') !== -1) {
				// this _id was already inserted in the database
				sys.log("Id is already in DB ->" + err);
			}
			if(err === null){
				sys.log("JSON added to database");
			}
		});
	
	}