End Of File quandry

[st3ve]

I have a form with my own navigation buttons on it. Using the 'built in' access navs might be better, but I need to do it this way to include extra code on the buttons. What code do i add, to prevent the buttons overrunning the end of the file?
Something like..

If tblMailLog.EoF is true then
do nothing
else
execute some code here and go to next record?

Thanks for looking.