displying confirmotion box.

Question

Hi All, I have another issue in my app. I have a dropdownlist, 2 textboxes and radio buttons. When the page loads, it fills the dropdownlist with all the data from database. When the user selects any item rom dropdownlist, it displays the appropriate items in those textboxes and radio buttons. After the selection from dropdown the user can change the text in the textboxes. Now what I want is, When the user changes the text boxes and selects another item from dropdown without saving the changed record, then it should display a confirmation box like "you didn't save the changes. Do you wish to save changes?" OK and Cancel buttons. Does anybody have any Ideas? Please help me out. Thanks....