Refering to a form in another Frame

I have to Frames (A and B). Frame A contains a form. Now, i want to Change the Value of a field that is in this form from frame B.

Is this possible?

I thought it should be something like this:

document.frames[0].form[0].fieldname.value="BlaBla";

But it does not work.
stinnuxAsked:
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cheroldConnect With a Mentor Commented:
To refer to a different frame, first you need to reference the top frame, like top.frames[0].document.forms[0].fieldname.value

Observe:
main.html:
<HTML><HEAD><TITLE>main</TITLE></HEAD>
<FRAMESET ROWS="50%,*">
<FRAME NAME="one" SRC="one.html">
<FRAME NAME="two" SRC="two.html">
</FRAMESET>
</HTML>

one.html:
<HTML>
<HEAD><TITLE>one</TITLE></HEAD>
<BODY>
<FORM ACTION="" METHOD=GET>
<INPUT TYPE="text" NAME="test" VALUE="test">
<A HREF="#" onClick="document.forms[0].test.value='changed from one'">click</A>
</FORM>
</BODY>
</HTML>

two.html
<HTML><HEAD><TITLE>two</TITLE></HEAD>
<BODY>
<A HREF="#" onClick="top.frames[0].document.forms[0].test.value='changed value'">click here</A>
</BODY>
</HTML>
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