MooTools Allowing Numbers

Allowing Only Numbers into a Input box.

var numbers = [8,9,13,37,39,46,48,49,50,51,52,53,54,55,56,57,96,97,98,99,100,101,102,103,104,105];

$('numeric').addEvent('keydown', function(key) {
	for (i = 0; i < numbers.length; i++) {
		if(numbers[i] == key.code) {
			return false;
		}
	}
	return true;
});

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