Help me,please. About run a hide button in the Netscape4.78

first and foremost,thank for you look this message,I first spoke in this forums. I am doing a workflow sample with Notes,and the sample can be ran

in Notes Client,IE5.0 and NS4.78 .

My the way is that call hide button’s event by Javascript in the subform.

In these event,call agent.In Notes client and IE5.0,has no problem,

but In the NS4.78 the hide button can not be called,

because that these hide buttons been in hidden table (or layer).

When be called in NS4.78,Javascript error happend.(in NS7.1,no problem)

Who can help me find a key to the settlement of the problem, or,another better idea for it?

Thanks very much!