message from Facebook com

[chouanne]

Since the last two days I have a message in a long square white box at the bottom of my monitor screen asking me if I want to " save or cancel from Facebook.com some files. it always starts with : ai_php?aed+AQK but then after the AQK different numbrs and letters come on such as : kkQV_9SrJqv6bn6A17nzfJTKrkIhOEJFZkXNRye etc........ it fills a whole line of numbers and letters. I have tried to click on save or delete, even click on the x sign to close the info box to make it disappear from the screen but it refuses to disappear. What is going on??? I thought it only came on when I was on Facebook but now it is on my AOL and Hotmail page also. I have nO idea where those files from Facebook come from and I wish to get rid of the message. Please help!!!