How to get value back from Ajax Modal Pop Up in ASP.Net?

i am using Ajax Controlkit 3.5, the problem is that i am using one BUTTON with some LABELS, when i click that button Ajax Modal Pop Up shows up , then there are some fields in the table which is inside Modal Pop Up with a BUTTON , now i want that when a user clicks a Button inside the Pop Up , the values which he had entered in the pop up TEXTBOXES must be shown in the LABELS which is on the Page //// how to do it ??? Please Reply Fast ...