if == “BackCompat”) {
cWidth = document.body.clientWidth;
cHeight = document.body.clientHeight;
sWidth = document.body.scrollWidth;
sHeight = document.body.scrollHeight;
sLeft = document.body.scrollLeft;
sTop = document.body.scrollTop;
}else {
== “CSS1Compat”
cWidth = document.documentElement.clientWidth;
cHeight = document.documentElement.clientHeight;
sWidth = document.documentElement.scrollWidth;
sHeight = document.documentElement.scrollHeight;
sLeft = document.documentElement.scrollLeft == 0 ? document.body.scrollLeft : document.documentElement.scrollLeft;
sTop = document.documentElement.scrollTop == 0 ? document.body.scrollTop : document.documentElement.scrollTop;
}