Fly screen problems

[Snoopy]

Hi all, hopefully can get some advice, tried to clean our window fly screen in our 2003 hymer, then ooops it came out from the top was pretty slack at the sides but always pulled up and down ok, until now it's completely fallen out appreciate any advice, I've tried searching through the net.. But no clue?,

 

[Rjcamper]

Picture would help?

 

[Snoopy]

Yes, was going to get that sorted, then hubby chatted to chap who did our habitation check, looks like that will be the way forward, will watch and learn