function closeDiv() { 
document.getElementById('floatLayer').style.left = "-1000"; 
return false; 
} 

window.onerror = null; 

<!--- para altitud que bajara el banners---->
var topMargin = 80; 
<!---    --->
var slideTime = 3000; 
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', pageWidth * .2); 
window.setInterval("main()", 10) 
} 

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 ) { 
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(); 
} 
}