Post back Problem - popup window

I am using ASP.NET 2.0

I have three asp.net form 1st for customer, 2nd for  Supplier third for employee and for saving/displaying the address information of any one of these three, I use a form "Address.aspx" as popup window. This "Address.aspx" form can call from all three screens. The problem is that when I call this "Address.aspx" popup window from any one of the screens it show the correct Address information but when I again call "Address.aspx" popup window from any other screen, it show me the address information of the first screen, so the address information remain same as the address information of the screen from where I first call this popup window. I think this is some postback problem.

For open "Address.aspx" form as popup window, I do the following;

In form load of code behind of customer, Supplier and employee form

 

Dim ScriptOpenModalDialog As String = "javascrip ...