"dots[i].obj has no properties"

[admin]

Hello, I'm trying to adapt a javascript that doesn't seem to work with current versions of Netscape/Mozilla ...

I have these lines in it:

dots.obj.left = dots.X;
dots.obj.top = dots.Y;


And I get this error message from FireFox javascript console:
"dots.obj has no properties"

How could I correct this ?
(Thank you)