how to get value from page in inline popup window?

Hi all,
 The following is my task,
 I have a form called index.aspx and i have some textbox and dropdown controls in this form.  And i have a button on this page. When i click this button a inline popup should be opened and in that form i need to fill some values then when i submit here all the values will be stored in database. but when popup opened i should get all the values entered in index.aspx page in this popup to store in database. How to do this?



Thanks



...