dimension of a document

From: Isabel
Date: 24 Mar 2004
Time: 03:29:21
Remote Name:


HI DANIEL!I was so quick to post my question last time and i forgot to salute you and congratulate you for this great site,it really helped me learn photoshop. My question is:when you open a document in photoshop(can be to make a header or web button etc..),how to you decide the dimemsions(width and height) of your document according to what you want to do,and if it doesnt matter..how do you make it fit in your page while in frontpage.Im more like a french speaking person but i hope you understood my question some how.