// Task 1
(function() {
	var link = $('a');
	var div = $('div');
        // use this link and div which has scope only here
})();
// Task 2
(function() {
	var link = $('a');
	var div = $('div');
        // use this link and div which has scope only here
})();
Both are same variable but they will not affect each other.