Well i belive when working on web ..

every thing is dependent on the web browser..

either we use ie or firrefox..

the only way to get screen size is

Scree.width or scree.some thign aomething..

the point is

from browser we can only find the details of one browser.. soit is restricted..

if really we want to do any thin g..

we have to do changes in browser..

if MS or any body writes any codes which checks the no of display plugins... and then calculate the amount of width and height..

then only this problem can be handled..

but i belive this will never happen.. because in the priority .. this problem stands at bottom...

and another problem is ..

platform

like hardware conf s diff on diff. plat form..

another..

theristriction on accessing client's information...

last but not least

full screen

is just a popup window

which is handeled by silverlingt internally so that there could no  security message on popup

any popup fullscreen only covers the current screen...

So finally we have to move on...

"If this answer helps you hten mark it as answered"