The scrip below can be added to x5 and made to have snow or leaves or any other picture / object fall down on your page or website.
Also there are several option you can configure.
Download the script as zip file frome here, there are some pictures in it for leaves or snow falling. There is small explanation in the text file on how to use and what how to configure. (set the complete text file in x5, use ctrl-a to select, ctrl-c to copy, ctrl-v to paste)
Don't forget to set your website adress, this is mandatory. this is done in the script itself below this text:
//Configure below the URL path to your own websitename -> (change below yourwebsite.com to your own website adres.)
If you have any questions please let me know.