Question : Java script in asp.net

I have this code that gets called when a user clicks on a button

  function ProcedureTest() {
            onclick = FixedPopupWindow('TestPopup', true, 300, 300);
            return false;
        }

Could somebody explain it to me? What is TestPopup and how would i see it?

Answer : Java script in asp.net

May be you are using MDI framework and Testpopup could be the window name and you are passing the size of the window.