Popup on editing selective textboxes possible?

I have an issue with a popup in Asp开发者_StackOverflow社区.net using AJAX. Is it possible to show one kind of popup when the user edits few textboxes and the other kind of popup for the remaining textboxes.

I guess it is possible with some javascript function. Couls someone help me out?

Thanks in advance!

Can't you simply add the following javascript onfocus of the textboxes' which need popup1

$find('modalpopup1').show();

and analogous on the other textboxus' onfocus which need popup2 to show

$find('modalpopup2').show();