window.onerror = null;
var topMargin = 0;
var topPos    = 188


var slideTime = 900;
var ns6 = (!document.all && document.getElementById);
var ie4 = (document.all);
var ns4 = (document.layers);





function setBorder (id, bOn) {
  var oBorder = document.all.item (id);
  if (!oBorder) return; 
  if (bOn)
    { oBorder.bgColor = "#F0F8FF"; }
  else
    { oBorder.bgColor = "white"; }
}



function layerObject (id, left) {
  if (ns6) {
    this.obj = document.getElementById (id).style;
    this.obj.left = left;
    return this.obj;
  } 
  else 
    if (ie4 && document.all [id]) {
      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', 0);
  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 && document.all ("floatLayer") != null) {
        this.currentY  = document.all ("floatLayer").style.pixelTop;
        this.scrollTop = document.body.scrollTop;
        mainTrigger ();
      }
}



function Max (a, b) {
  if  (a > b) 
    { return a }
  else
    { return b }
}



function mainTrigger () {
  var newTargetY = Max (this.scrollTop, this.topMargin + topPos);
  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 ();
    }
}



function displayWindow (url, width, height) {
  var Win = window.open (
              url, 
              "displayWindow", 
              'width=' + width + ',height=' + height + ', resizable=0, scrollbars=no, menubar=no'
            );
}            



function switchImage (id, imgName)
{
  if (document.images) {
    document.images [id].src = eval (imgName + ".src");
  }
}