Using this for a function while using $.post

I'm trying to access this in a function/class to access another function but I keep getting the following error:

Uncaught TypeError: Object #<Object> has no method 'SetOptions'

Here is my code:

1. this.newFilter = function() {


2. var info = this.getProductInfo();


3. var r = isEmpty(info.range) ? '' : info.range;


4. var g = isEmpty(info.grade) ? '' : info.grade;


5. var s = isEmpty(info.species) ? '' : info.spacies;


6. var t = isEmpty(info.thickness) ? '' : info.thickness;


7. $.post("ajax.php", {range: r, grade: g, species: s, thickness: t}, function(data) {


8. var obj = false;


9. try {


10. obj = JSON.parse(data);


11. }


12. catch (error) {


13. return;


14. }


15. this.SetOptions("grade", obj.grade);


16. this.SetOptions("species", obj.species);


17. this.SetOptions("thickness", obj.thickness);


18. });


19. }

The lines this.SetOptions(...); that is the function I am trying to access within the function. How can I do this in a $.post?

via jQuery Forum http://forum.jquery.com/topic/using-this-for-a-function-while-using-post#14737000004463902