private variable to Javascript object literal

	var dataset = {
	tables: {
	customers:function(){
	var privateVar = 'foo';
	return {
	cols:[ /*here*/ ],
	rows:[ /*here*/ ],
	getPrivateVar: function()
	{
	return privateVar;
	}
	};
	}(),
	orders:{
	cols:[ /*here*/ ],
	rows:[ /*here*/ ]
	}
	},
	relations: [{
	parent:'customers',
	child:'orders',
	keyparent:'custid',
	keychild:'orderid',
	onetomany:true
	}]
	};
	alert( dataset.tables.customers.getPrivateVar() );

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http://stackoverflow.com/questions/1396294/how-to-add-private-variable-to-this-javascript-object-literal-snippet