Assertions:
In all versions of Netscape, if no SRC attribute is initially
specified, the frame area is no longer addressable as a target (even if a NAME is specified)
for document links, etc. Internet Explorer and Opera handle the case of an initial
blank SRC just fine.
Hyperlink to top/right frame (frame initially contains a document)
Hyperlink
Hyperlink to bottom/right frame (frame initially contains no document)
Hyperlink