var topMargin 	= 140 
 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 (ns4) { 
 this.currentY 	= document.consultor.top; 
 this.scrollTop	= window.pageYOffset;
mainTrigger();
 } else if(ns6) {

this.currentY = parseInt(document.getElementById('consultor').style.top); 
 this.scrollTop = scrollY;
  mainTrigger(); 
 } else if(ie4) { 

 this.currentY 	= consultor.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 )consultor.style.pixelTop = newY 
	if ( ns4 )document.consultor.top = newY
	if ( ns6 )document.getElementById('consultor').style.top = newY + "px" 
} 
} //Favor não retirar os créditos. http://www.scriptsfree.net