wow!! thanks rayraz..answers all my questions and more.. 

it all stays on the cloud and gets changed when i change it..ie.. download and install dropbox on my laptop.. upload files into the cloud, acess my account from a computer a million miles away that doesn't have dropbox so i access thru the browser.. and i take it i can download my file..make changes and reupload it again. i suppose i can upload files too from that computer.. and it automatically updates my dropbox account.. which i access on my laptop, already updated. utterly mad...coz i ought to be able to just access the acount from a cloud...(that's a woman reasoning here..;-p) 

(that now sounds like..You say eether and I say eyether, You say neether and I say nyther; Eether, eyether, neether, nyther)

will give it a shot..  

cheers and hugs for all that help..