The arrows, top left, go forward and backwards to the next or previous screen of the existing tab, i.e. the screen you are looking at now.
You will have to change screens by clicking on another tab in the Links bar then the arrows will work for that particular tab.
It's like having two cameras. you can see different pictures on one camera but have to open the second camera to see the other pictures.
If you see what I mean?
Sorry -just checked my Q for replies.
Cant believe it worked doing what you said !.Cheers for that it was so annoying having to come out the page I was on to go onto another one (if you know what I mean!!)
Thank you for your help.