A Good Theme Previewer

Hello,

I have tested several different “theme previewer” so that my website visitor’s can test drive the themes I have to offer.

I have found a few good ones but seem to always run into a glitch that I believe can not be resolved by the specific plugin.

What happens is that the theme will be previewed correctly but if another link is clicked within the theme preview that window converts back to my theme (not the one being previewed).

OR

The theme will be previewed correctly and no matter what link is clicked, the theme will stay as the one being previewed. Which is OK but the problem is that it also changes the site theme (for that user) and not just the one being previewed.

Make sense?

What I am looking for is a good theme previewer as seen on some other locations like woothemes and such.

Any ideas?

Thanks much!