With updated links now:

Hi Folks!

I would like to use some flash objects and a lightbox alternative, for example colorbox for my site. I use SS 2.3.3.
The common problem is, that flash objects are normally over the lightbox, so I normally have to set wmode=transparent by the flash object.

But with Silverstripe it's a little different:
It's working fine in Firefox without wmode=transparent, but not in IE and G-Chrome.
If I set wmode=transparent, it works fine with IE, but the flash doesn't work more in FF3.
What can be the reason for this?
Should I embed the SWF in a different way? I embedded the SWFs normally with the Tiny mce in this way: "<object width="180" height="325" data="assets/Uploads/almenu-iroda-berelheto-zsoltudvar-gale.swf" type="application/x-shockwave-flash"><param name="src" value="assets/Uploads/almenu-iroda-berelheto-zsoltudvar-gale.swf" /></object>"
or
"<object width="180" height="325" data="assets/Uploads/almenu-iroda-berelheto-zsoltudvar-gale.swf" type="application/x-shockwave-flash"><param name="wmode" value="transparent" /><param name="src" value="assets/Uploads/almenu-iroda-berelheto-zsoltudvar-gale.swf" /></object>"

Example for without wmode setting (it's working fine with FF3, but not with IE):
xxx

Example for wmode=transparent setting (it's working fine with IE, but the SWF is damaged in FF):
xxx

Thank you for your help!