Hide / Show Safari issues

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I have an interesting issue in Safari where I have a DIV and inside
that DIV I have an IFRAME. If I do a hide or show of the DIV using
dv.style.display="none" or dv.style.display="block" with dv being the
DIV Object itself it reloads the IFRAME and I now end up with the
content of the IFRAME twice within the DIV (one under the next).

This code works fine in IE 6 and 7, Firefox, Netscape 8/9 and even on
Firefox on the Mac. Anyone have any idea what the issue might be in
Safari and how I can work around it.

If it helps I can supply a simple example.

Thanks
Ed