Your sitedesign is wonderful. I've tested with IE6, Netscape 6.2 and Opera 6 and everything works fine. Netscape 4 is old browser that does not even support CSS and other webstandards. Netscape 6.2 is not resource intensive and I found no security problems. Maybe this was an issue with the first release of N6 but not with the final version. And updating won't hurt anybody.

Every organisation rests upon a mountain of secrets ~ Julian Assange