var marqueeSpeed = 1;

function marqueeScroll(){
  var Marquee     = document.getElementById("webpageMarquee");
  var MarqueeSize = document.getElementById("webpageMarqueeBox").offsetWidth;
  var curLeft = parseInt(Marquee.style.left);
  if (curLeft + MarqueeSize < 0) Marquee.style.left = MarqueeSize + "px";
  else Marquee.style.left = eval(curLeft - marqueeSpeed) + "px";
}

function marqueeStart() {
  var Marquee     = document.getElementById("webpageMarquee");
  var MarqueeSize = document.getElementById("webpageMarqueeBox").offsetWidth;
  Marquee.style.left = MarqueeSize + "px";
  Marquee.style.visibility = "visible";
  Marquee.style.display = "block";
  setInterval("marqueeScroll()",25);
}