MS JScript runtime error

Cliking to some sites produce the following:
A script error occured. Some scrips on the
affected page may not work correctly.

MS JScript runtime error

Error Oblect expected.

Do you want to continue?

So I continue and things seem ok.

PowerBook Firewire (Pismo)
OS 9.2.2
IE 5.1.7

Thank you,
– Tony D