Url Rewriting Edit Webscript To Add A Variable To End Of Seo

url rewriting edit webscript to add a variable to end of seo urls for example

this is normal url be4 variable added

example.com/9919/man-falls-on-ground/

this is url with (funny video) added to all video urls on website

example.com/9919/funny-video/man-falls-on-ground/