If they aren't already contained in an array, you could add them to one and then use the filter
method to remove the duplicates:
var arr1 = [33333, 90201, 87678, 45665, 343144, 17645, 67503, 48796, 37657, 33333, 45665];
var deduped = arr1.filter(function(elem, pos) {
return arr1.indexOf(elem) == pos;
});
console.log(deduped); // [33333, 90201, 87678, 45665, 343144, 17645, 67503, 48796, 37657]
Demo.