confusing problem with Magic Ajax

Question

i am writing an app using ajax. basically i have 3 asp:buttons on screen and 3 invisible asp:panels, in each panel theres a selection of tickboxs. when i click button 1 i want to show panel 1 etc. i want the user to be able to tick 1 box on panel, a couple on panel 2 and a couple on panel 3. On my development machine (Win Xp Pro, .Net Framework 1.1) its works fine. U can click button 1, tick 2 boxs, then click button 2 and tick 1 box then when u go back to button 1 it shows the boxes still ticked but my web host machine (Windows 2000 Server, .Net Framework 1.1) it doesnt save the ticked tick boxes and they r all unticked. what can this be?? is it windows 2000 server that is the problem??