var topMargin = 85;
var slideTime = 1200;
var ns6 = (!document.all && document.getElementById); 
var ie4 = (document.all);
var ns4 = (document.layers);
window.setInterval("main()", 1);

function floatObject() { 
	if (ns4 || ns6)
	{
		findHt = window.innerHeight; 
	}
	else if(ie4)
	{
		findHt = document.body.clientHeight;
	}
}

function main() {
	if (ns4) {
		this.currentY = document.floatLayer.top;
		this.scrollTop = window.pageYOffset;
		mainTrigger();
	}
else if(ns6)
	{
		this.currentY = parseInt(document.getElementById('floatLayer').style.top); 
		this.scrollTop = scrollY;
		mainTrigger(); 
	}
else if(ie4)
	{
		this.currentY = floatLayer.style.pixelTop;
		this.scrollTop = document.body.scrollTop;
		mainTrigger();
	}
} 

function mainTrigger() { 
	var newTargetY = this.scrollTop + this.topMargin 
	if ( this.currentY != newTargetY ) { 
		if ( newTargetY != this.targetY ) { 
			this.targetY = newTargetY
			floatStart(); 
		}
	animator(); 
	}
} 

function floatStart() { 
	var now = new Date() 
	this.A = this.targetY - this.currentY 
	this.B = Math.PI / ( 2 * this.slideTime ) 
	this.C = now.getTime() 
	if (Math.abs(this.A) > this.findHt) { 
		this.D = this.A > 0 ? this.targetY - this.findHt : this.targetY + this.findHt 
		this.A = this.A > 0 ? this.findHt : -this.findHt 
		}
	else
	{
	this.D = this.currentY 
	}
} 

function animator() {
var now = new Date() 
var newY = this.A * Math.sin( this.B * ( now.getTime() - this.C ) ) + this.D 
newY = Math.round(newY) 
if (( this.A > 0 && newY > this.currentY ) || ( this.A < 0 && newY < this.currentY )) { 
	if ( ie4 )floatLayer.style.pixelTop = newY 
	if ( ns4 )document.floatLayer.top = newY
	if ( ns6 )document.getElementById('floatLayer').style.top = newY + "px" 
	}
}