Hi, I have a dropdownlist in aspx page. I want to pass in some paramter via the onchange() function to the ModalPopup.

Note that onchange() is the javascript function (for some reason, I can only pass in paramters in client side).  What i want is by selecting something in the dropdown, I can pass in something to a textbox in the ModalPopup user control. So that in the ModalPopup user control, I could have a label say "You've selected *** in the dropdown.". Note that the Label is in the user control.

I'm using atlasToolkie:ModalPopupExtender (C#). Can anyone teach me how to do it? Thanks a lot.