Closing parents parent html file

HI i have 4 html files a.html,b.html,c.html,d.html. when i click a button in a.html a small window opens that loads b.html in it, wheni click a button in b.html.. the window with b.html gets closed and another window c.html opens... now when i click a button in c.html i want to close a.html which is still open and the master parent of all... and in place of a.html i want to open d.html...

Can anybody suggest me how do i access the parents parent window.. as here for c.html .. parent is b.html.. which needs to be closed.. and a.html is b.html's parent.

You can not close windows that are NOT opened up with JavaScript.

Eric

All the windows are open using javscript.... like

var window1=window.open("a.html",'','')

ruquia tabassum wrote:All the windows are open using javscript.... like

var window1=window.open("a.html",'','')

I believe the poster already knows that.

Their description of their problem states they are opening windows.

i did not get it.. i want to close the window a.html from c.html, which is parents parent of c.html.... can anybody suggest me.. how do i do this?