window.onerror = null;
var topMargin = -95;
var slideTime = 1200;
var ns6 = (!document.all && document.getElementById);
var ie4 = (document.all);
var ns4 = (document.layers);

function layerObject(id,left)
{
	if (ns6)
	{
		this.obj = document.getElementById(id).style;
		this.obj.left = left;
		return this.obj;
	}
	else if(ie4)
	{
		this.obj = document.all[id].style;
		this.obj.left = left;
		return this.obj;
	}
	else if(ns4)
	{
		this.obj = document.layers[id];
		this.obj.left = left;
		return this.obj;
   }
}

function layerSetup()
{
	floatLyr = new layerObject('floatLayer', 0);
	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.layers["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 ) && (newTargetY<=document.body.scrollHeight-430))
	{
		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 ) document.all.floatLayer.style.pixelTop = newY;
if ( ns4 )document.layers["floatLayer"].top = newY;
if ( ns6 )document.getElementById('floatLayer').style.top = newY + "px";
   }
}
function start() {
if(ns6||ns4) {
pageWidth = innerWidth;
pageHeight = innerHeight;
layerSetup();
floatObject();
}
else if(ie4) {
pageWidth = document.body.clientWidth;
pageHeight = document.body.clientHeight;
layerSetup();
floatObject();
   }
}