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var dw = document.documentElement.offsetWidth;
var dh = document.documentElement.offsetHeight;
document.write("dw:"+dw + "<br> dh:"+dh);
document.write("<br>");
var bw = document.body.offsetWidth;
var bh = document.body.offsetHeight;
document.write("dw:"+bw + "<br> dh:"+bh);
document.write("<br>");
var bdw = document.body.offsetWidth || document.documentElement.offsetWidth;
var bdh = document.body.offsetHeight || document.documentElement.offsetHeight;
document.write("bdw:"+bdw +"<br> bdh:"+bdh);
document.write("<br>");
var dbw = document.documentElement.offsetWidth || document.body.offsetWidth;
var dbw = document.documentElement.offsetHeight || document.body.offsetHeight;
document.write("dbw:"+dbw +"<br> dbw:"+dbw);
</script>
