Div / Visibility Problem

Cna someone please tell me why the code inside the case that will handle Netscape is not working? The check for document.layers handles Netscape fine but when the inside code is reached it gives an error. Below is the function that is called when a button on the form is pressed, then the div tag line, and then the error message I received. I'd greatly appreciate any help you could give. Thanks.
Rob
============================================
if (document.all) {
document.isearch.all.GenSearchID.style.visibility = (document.isearch.all.GenSearchID.style.visibility == 'visible' ? 'hidden' : 'visible');
} else if (document.layers) {
document.isearch.GenSearchID.style.visibility = (document.isearch.GenSearchID.style.visibility == true ? false : true);
} else {
document.isearch.GenSearchID.visibility = (document.isearch.GenSearchID.visibility == 'visible' ? 'hidden' : 'visible');
}
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<div id="GenSearchID" style="display: none">
==========================================
document.isearch.GenSearchID has no properties.

Hey,
Does anyone know why out there in the WebWorld?
Rob

The reason why is you are using the wrong code for netscape.
IE-->document.all
NN4-->document.layers
NN6+-->document.getElementById
getElementById is also supported by modern IE browsers
now to hide the div with NN4 you need to use a layer tag and surround the div. since NN4 does not support duv but the layer tag. Great Huh!?!
The syntax you are using is making me wonder. What is isearch??
document.all.DIVname.style.visibility=""
document.getElementById.DIVname.style.visibility=""
document.layers.DIVname.visibiity=""
Eric

And ponder for a moment: is it really worth all the time and hassle to special-case functionality for NN4 when it has such a miniscule market share at this point?
bear

Take a look at this

http://www10.brinkster.com/a1ien51/JavaRanch/showhidetoggle.htm
Eric

Hi Eric,
The isearch is actually the form that has the div tag in it. I've been trying different things to get this to work so at the final point of frustration I grabbed the code and posted it. Thanks all for the help.
Rob