[monolithed]

<script type="text/javascript">
window.onload = function(){
var opera = (navigator.userAgent.toLowerCase().indexOf('opera') > -1),
    html = document.documentElement,
    body = document.body,
    w = document.compatMode=='CSS1Compat' && !opera ? html.clientWidth : body.clientWidth,
    h = document.compatMode=='CSS1Compat' && !opera ? html.clientHeight : body.clientHeight;
    alert("Размер вьюпорта: "+  w +"х"+ h);
};
</script>