window.onerror = null;

var ns6 = (!document.all && document.getElementById);
var ie4 = (document.all);
var ns4 = (document.layers);

var topMargin;
var slideTime = 1000;

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

function layerSetup()
{
	if (ns4) {
		iLeft = document.layers["floatLayer"].left;
		iTop = document.layers["floatLayer"].top;
	} else if(ns6) {
		iLeft = parseInt(document.getElementById('floatLayer').style.left);
		iTop = parseInt(document.getElementById('floatLayer').style.top);

	} else if(ie4) {
		iLeft = floatLayer.style.pixelLeft;
		iTop = floatLayer.style.pixelTop;
	}
	this.topMargin=iTop;

	floatLyr = new layerObject('floatLayer', iLeft/*pageWidth * .5*/);
	window.setInterval("main()", 5)
}

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;
	} else if(ns6) {
		this.currentY = parseInt(document.getElementById('floatLayer').style.top);
		this.scrollTop = scrollY;
	} 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 )document.all.floatLayer.style.pixelTop = newY;
		if ( ns4 )document.layers["floatLayer"].top = newY;
		if ( ns6 )document.getElementById('floatLayer').style.top = newY + "px";
	}
}

function LoadFloat()
{
	if(ns6||ns4)
	{
		pageWidth = innerWidth;
		pageHeight = innerHeight;
	}
	else if(ie4)
	{
		pageWidth = document.body.clientWidth;
		pageHeight = document.body.clientHeight;
	}
	
	if(screen.height>600)
	{
		layerSetup();
		floatObject();
	}
}