Placering på x-akse

Halløj

Jeg fandt det her script til at flytte et layer når en bruger scroller ned af siden. Men jeg kan kun styre den vertikale placering. Hvordan styrer jeg den horisontale?

window.onerror = null;

var topMargin = -1;
var menu1Time = 1000;
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('menu1', pageWidth * .15);
  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["menu1"].top;
    this.scrollTop = window.pageYOffset;
    mainTrigger();
  } else if(ns6) {
    this.currentY = parseInt(document.getElementById('menu1').style.top);
    this.scrollTop = scrollY;
    mainTrigger();
  } else if(ie4) {
    this.currentY = menu1.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.menu1Time );
  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.menu1.style.pixelTop = newY;
      if ( ns4 )document.layers["menu1"].top = newY;
        if ( ns6 )document.getElementById('menu1').style.top = newY + "px"; 
  }
}

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