Set wmode to transparent in embed code

As I mentioned in http://drupal.org/node/518022, we found an issue with the embed code where wmode is not set to transparent. This is causing dropdown menus on our site to appear behind the slideshowpro swf. We've added a quick wmode=transparent parameter to the embed code, but we'd love to see this get into the module so that we can update when the time comes.

Attached is a small patch to change the embed code (needs to be properly formatted). I also wonder about restructuring to have the embed markup in the theme function. This might provide the option to add different parameters moving forward.

I should also mention that I found this issue http://drupal.org/project/issues/slideshowpro that deals with this and a few other items, but I thought it might be wise to split this out as it's own issue since that was made against d5. If it makes sense to stick with that instead, feel free to give that direction.

Thanks again!