Sorry, but I don't know what the first remark means. Yes I am uploading this to my website and to test it, running it from my browser's address bar. So I type in www.mydomain.com/.../test.pl?f=sdfkjkkk which is then supposed to delete the file (the file name will not be immediately what f= as I realise this would be a major security risk, but it is at the moment until I can get this thing to work)!
The reason I said it wasn't a priveleges problem is that when my uploaded script contains the filepath typed directly "../../alpha/abcde" it does delete but when I use $ful it does not - so they both have been run the same way. I am grateful for any help.