Edit myvideoblog plugin of wordpress to have prewiev thumb

I have a website where i have been used the plugin of wordpress PhpMyVideoBlog for mass embeding video from adult tube sites. The videos are just embed from another adult tube sites, but their thumbnail are downloaded automatically on my server. The videos comes with normal thumbnail , but i want the thumbnail to become dynamically, every thumbnail of a video need to make the prewiev of their video on rollover , by showing some pictures of the video, like on xvideos site. I use WordPress 3.0.4 with PHP MyVideoBlog PRO V3.2.3 , i put their kits attached on this project, that you can donwload them, insatall and edit the plugin, because i don't have a test version of the site.