The movie size you set is the movie size you get sort of.
you size the dimensions of your movie on the movie tab.
To increase the area of view you could always...
Remove the 5pixel margins on the html document
this is done by replacing the <body> tag in the html document with this
<BODY TOPMARGIN=0 LEFTMARGIN=0 RIGHTMARGIN=0 MARGINWIDTH=0 MARGINHEIGHT=0 scroll=no>
that will remove the margins and the scroll bar.
If you look inside the embed tag for the swf you'll notice dimensions. You can replace the dimensions with percentages. Be cautious Netscape has a tendency to crash if the percentage is 100% x 100% and inside a table.
You can also just use the swf as a url so that when you link to the swf you are linking to a swf file instead of an html document.
Please take the caps off. It's considered shouting generally ppl who ask get better responses then ppl who demand.