var IE = (document.all) ? true : false;
var NS = (document.layers) ? true : false;

function placeFloater(){
	var floaterW = 0;
	var otherW = 0;
	var winW, floaterLeft;
	if(IE){
		winW = document.body.clientWidth;
	}else{
		winW = window.innerWidth;
	}
	if(winW*otherW>760){
		floaterLeft = (winW - winW * otherW) / 2;
	}else if(winW<760){
		floaterLeft = 0;
	}else{
		floaterLeft = (winW - 760)/2;
	}
	if(IE){
		document.all.floater.style.pixelLeft = floaterLeft;
	}else{
		document.floater.left = floaterLeft;
	}
}
window.onresize = placeFloater;
window.onload = placeFloater;

var lastScrollY = 0;
function float(){
	if(IE){diffY = document.body.scrollTop;}
	if(NS){diffY = self.pageYOffset;}
	if(diffY != lastScrollY){
		percent = (diffY - lastScrollY)*0.1;
		if (percent > 0){
			percent = Math.ceil(percent);
		}else{
			percent = Math.floor(percent);
		}
		if(IE){
			document.all.floater.style.pixelTop += percent;
		}
		if(NS){
			document.floater.top += percent;
		}
		lastScrollY = lastScrollY + percent;
	}
}
doFloat = window.setInterval("float()",1);
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