var topMargin 	= 0 ;
var slideTime	= 1200;
var ns6 = (!document.all && document.getElementById); 
var ie4 = (document.all);
var ns4 = (document.layers);
var ie6 = (document.documentElement);

window.setInterval("main()", 10) ;




function floatObject() 
{ 
	findHt =	(ns6||ns4) ? innerHeight : document.body.clientHeight;
} 
	
function main() 
{ 
	if (ns6) 
	{
		this.currentY = parseInt(document.getElementById('floatLayer').style.top); 
		this.scrollTop = scrollY;
		mainTrigger(); 
	}
	else
	if (ns4) 
	{ 
		this.currentY 	= document.floatLayer.top; 
		this.scrollTop	= window.pageYOffset;
		mainTrigger();
	} 
	else 
	if (ie6)
	{
		this.currentY 	= parseInt(document.getElementById('floatLayer').style.top); 
		this.scrollTop	= document.body.scrollTop; 
		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" 
	} 
}