// Java Document
var startY = 10;
var sy;

function floatMenu()
{
  if(document.documentElement.scrollTop)
  {
    sy = document.documentElement.scrollTop;
  }
  else
  {
    sy = document.body.scrollTop;
  }

  var temp = sy + startY;
  var newY = temp.toString() + "px";

  var elem = document.getElementById("menu");
  elem.style.top = newY;
}

window.onscroll = floatMenu;