Target of link , need help

[JooClops]

Hi,
My website is built by frames.
left, right and top
looks abit like that :

____________
____________
    |
    |
    |
__|_________

now lots of the links in the left side, are opened in the right said, and those likns have the option of back to main menu,now i won't those links in the right side that link to the main menu, open in the same window but not in this frame, I mean that the back to main menu won't act only on the right frame, but it will act as if You used "back" in your browser.
now how do I do that??
I know the target="" thing, but I only know "new, right,left" as targets,
can anybody help me?
thx
jc

[almostbob]

javascript Back Button

<a href='JAVASCRIPT:history.go(-1);'>Back button 1</a>
<a href="JAVASCRIPT:history.back(1)">Back Button 2</a>

php Back button

<a href="<?php echo $_SERVER['php_referer']; ?>">Back</a>

[JooClops]

Ok, first of all thanks :)
now,
the back button thing works, but now there is another problem:
there is a link to login in the left, which opens a login sheet on the right, after the user submits his details,he is being referred to member_index.asp , which is all the frames together, again, but with more options ... so what basically happens is frame inside a frame,
so how can I resolve this without opening another window/tab?
thanks in advanced
JC

[almostbob]

<a href='member_index.asp ' target = "_top">link</a>