I should explain:

I feel that I am close to a solution and didn't feel like changing my
slider completely, but I did try adding MOpacityControl to my project
and only one slider appeared, controlling the opacity for my entire
map, nothing for controlling my tile layers as a group.  Then, I took
a look at how you implemented it on:http://maps.forum.nu/
gm_custom_controls.html and saw a lot of: map.addMapType(cMap); going
on and thought that must be the only way to make it work.  I was
probably wrong in this assumption, but mainly I am trying to resolve
what I think to be a smaller compatibility issue with IE.

On Jun 25, 1:18 pm, Marcelo <[email protected]> wrote:
> On Jun 25, 7:43 pm, Joe <[email protected]> wrote:
>
> > Marcelo,
> > Yes, I have looked at MOpacityControl before, but I don't think it
> > will exactly work for my purposes.  Correct me if I'm wrong, but it is
> > creating a CustomMapType for each overlay,
>
> It doesn't create any map types or tile layers. Did you actually look
> at the source?
>
> --
> Marcelo -http://maps.forum.nu
> --
>
>  and fast switching between
>
> > 17+ of these would not be a fun.  As I said, I have modified the
> > maptiler.org slider, and in Firefox, it can in real time change the
> > opacity of all 17 overlays as I slide, by grabbing the divs.  Now, I
> > just need to replicate this behavior in IE - something I haven't been
> > able to do at this point.
>
> > -Joe
> > On Jun 25, 9:45 am, Marcelo <[email protected]> wrote:
>
> > > Have you tried 
> > > MOpacityControl?http://maps.forum.nu/gm_custom_controls.html
>
> > > Also implemented 
> > > here:http://maps.forum.nu/gm_main.html?lat=37.649034&lon=-96.855469&z=4&mT...
>
> > > --
> > > Marcelo -http://maps.forum.nu
> > > --
>
> > > On Jun 25, 4:17 pm, Joe <[email protected]> wrote:
>
> > > > I have a map that contains, at the moment, 17 large tile layers likely
> > > > with more to come.  I need to have an opacity slider on my map that
> > > > changes the opacity for all of the tile layers at once.
>
> > > > I have tried 
> > > > using:http://www.maptiler.org/google-maps-overlay-opacity-control/
>
> > > > I looks nice and works great - for one overlay.  But for 17, it runs
> > > > so slow that firefox asks me if I want to continue running the
> > > > script.  So, I tried to implement this:
>
> > > > On Aug 19 2008, 1:04 pm, bratliff <[email protected]> wrote:
>
> > > > >     map.addOverlay(whatever);
> > > > >     map.getPane(1).lastChild.id="yourdaddy"
> > > > >     var div=document.getElementById("yourdaddy");
>
> > > > > // For FF & others
>
> > > > >     div.style.opacity=whatever;
>
> > > > > // For IE
>
> > > > >     div.filters.alpha.opacity=Math.round(100*whatever);
>
> > > > > For IE, you will have to prime the pump with:
>
> > > > >     div.style.filter="alpha(opacity=100)";
>
> > > > > Otherwise, "div.filters" will be undefined.
>
> > > > > I believe "div.style.MozOpacity" is now obsolete.
>
> > > > from this thread:
>
> > > >http://groups.google.com/group/Google-Maps-API/browse_thread/thread/b...
> > > > which I can't reply to... is it closed? (I'm new here)
>
> > > > Anyway, it works great, and instantly in FF.  I can even have it
> > > > adjust all 17 as I slide the slider, but I can't figure out how to do
> > > > it for IE and this isn't working:
>
> > > > function setO(i, level) {
> > > >  var div=document.getElementById("overlay_id_"+i);
> > > > // For FF & others
> > > > // div.style.opacity=level;
> > > > // For IE
> > > > div.style.filter="alpha(opacity=100)";
> > > > div.filters.alpha.opacity=Math.round(100.0*level);
>
> > > > }
>
> > > > The first time this function is called in IE, all of my png tiles just
> > > > vanish.  I'm not exactly the expert on opacity in IE. Any ideas?
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