I would like to use DIV agains P align.

I don't want to use [P] paragraph on my website. So I can switch to the new line from new paragraph to [BR] that's good.
But when I set an align, the FCK use the [P align ...] again, but I prefer the div. I try to change the source, but the align comes from the browser as I see on the code (simple send a command to the browser to do it). So how can I tell the FCKeditr or the browser that forget the P and use the DIV ??? I don't know what about an IE or gecco developer commands
At last I can change every times by manual, but that is a terrible job