gistfile1.js

var objDefaultOptions = {
	alignment: 'left',
	dismissable: true,
	offset: -10,
	content: '',
	repeat: false,
	duration: false
};

jQuery.fn.notification = function(objSuppliedOptions){
	var options = objDefaultOptions;
	jQuery.extend(options, objSuppliedOptions);
	
	// ...

}