button visibility should dissapear after postback

Question

hai friends,

 i placed lot of buttons inside a table as shown below..

firstpage.aspx

BUTTON1	BUTTON2	BUTTON9
BUTTON4	BUTTON5	BUTTON6
BUTTON7	BUTTON8	BUTTON9

 here every button has a separate  page           for example : -   button5  has button5.aspx

so after come from button5.aspx page to firstpage.aspx the button 5 visibility has to disappear

BUTTON1	BUTTON2	BUTTON9
BUTTON4		BUTTON6
BUTTON7	BUTTON8	BUTTON9