Получите разрешение окна JavaScript
var clientWidth = document.documentElement.clientWidth;
$("h2").text(clientWidth);
Naughty Narwhal
var clientWidth = document.documentElement.clientWidth;
$("h2").text(clientWidth);var win = window,
doc = document,
docElem = doc.documentElement,
body = doc.getElementsByTagName('body')[0],
x = win.innerWidth || docElem.clientWidth || body.clientWidth,
y = win.innerHeight|| docElem.clientHeight|| body.clientHeight;
alert(x + ' × ' + y);