SOLVED

this was not a maps api issue - the problem is that IE7 treats
onchange as onchangeafteronblur, or to put it another way the onchange
event is not fired until the element loses focus, as I was using the
checkboxes like radio buttons just changing to onclick solved the
problem. The map is now live at http:www.lakesuk.com/



On Mar 6, 5:20 pm, Alan C <[email protected]> wrote:
> the map is athttp://www.lakesuk.com/index8.php
>
> When the checkboxes in the sidebar are clicked IE does not appear to
> remove or add the relevant marker overlays, but if you move your mouse
> pointer over to the vertical page scrollbar and click it the markers
> appear or disappear immediately as appropriate.
>
> It works as expected when viewed with FF 3.0.7 and Safari 3.2.1 on
> mac; Safari (4 beta) and FF 3.0.7 on pc, the issue only seems to show
> when using IE7 7.0.5730.13 on XP and Vista.
>
> I know my javascript is not very efficient, even so it's almost
> instant in browsers other than IE.
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