I have a imagebutton. This is part of a generic toolbar for my aplication (ASP.NET). This button is for save the form to a database. However, exist 2 form that requiere a pre-process for that, so i call a second popup-window form...i need wait for the user input here, and then back the data to the first form and if it is valid then post it...

I don't have problem with launch & manage a second form(jscript here...obvious) But i need cancel the default behaviou of the image button.

I do this:

btnGuardar.Attributes.Add("onclick", "AbrirFormaPago()")

And in the AbrirFormaPago jscript function i return false but the postback is raised...

How do this???

Thanks for your time...