如何将浮动div添加到beEF项目脚本中

in the beEF project there is a script that execute a fake flash update with a Gray background and an image for flash update. the problem is when the user scroll down. the background and the image still at the top of the page so i tried to edit the script and add some jquery code to make it move with the visitor when he/she scroll down but i couldn't do it. in the beEF project there is a script that exec