res script

can anyone tell me where i can find a script that figures out the clients resolution so i can get my site to fit right

screen.width
screen.height

^

OK so i put this script in to try for determining screen width and when my res is set to 1124 it tells me it is but when my screen res is set to 1024 or 800 it tells me its set to that and also tells me i have an error with my debugging else statement

function checkWidth() {
if (screen.width == 800) {
alert("firstone");
}
if (screen.width == 1024) {
alert("secondone");
}
if (screen.width == 1152) {
alert("thirdone");
}else{
alert("****edup");
}
}
checkWidth()
can anyone figure out why

that should work... :confused: