function reportError(msg,url,line) {
  var str = "You have found an error as below: \n\n";
  str += "Err: " + msg + " on line: " + line;
  alert(str);
  return true;
}

window.onerror = reportError;  

var obj_marquee = document.getElementById("marquee");
var repeat = null;
var marquee_spd = 50;

function marquee_init() {
  var obj_unit = obj_marquee.firstChild;
  var marquee_high = parseInt(obj_marquee.style.height);
  var marquee_wide = parseInt(obj_marquee.style.width);
  var unit_high = obj_unit.offsetHeight;
  var unit_wide = obj_unit.offsetWidth;
  var m = 0, n = 0, i = 0;
  var tmp = null;
  
  m = Math.ceil(marquee_wide / unit_wide);
  n = Math.ceil(marquee_high / unit_high);

  obj_unit.style.width = marquee_wide * (m+1);
  obj_unit.rows[0].cells[0].style.width = obj_marquee.style.width;
  
  for(i=0; i<m; i++) {
    tmp = obj_unit.rows[0].insertCell(-1);
    tmp.innerHTML = obj_unit.rows[0].cells[0].innerHTML;
    tmp.style.width = marquee_wide;
    tmp = null;
  }

  for(i=0; i<n; i++) {
    obj_marquee.appendChild(obj_unit.cloneNode(true));
  }

  return;
}

function marquee_show(direction) {
  switch(direction) {
    case "up":
      if(obj_marquee.scrollTop >= obj_marquee.children[1].offsetTop) {
        obj_marquee.scrollTop -= obj_marquee.firstChild.offsetHeight;
      } else {
        obj_marquee.scrollTop++;
      }
      break;
    case "down":
      if(obj_marquee.scrollTop <= 0) {
        obj_marquee.scrollTop += obj_marquee.firstChild.offsetHeight;
      } else {
        obj_marquee.scrollTop--;
      }
      break;
    case "left":
      if(obj_marquee.scrollLeft >= obj_marquee.firstChild.rows[0].cells[0].offsetWidth) {
        obj_marquee.scrollLeft -= obj_marquee.firstChild.rows[0].cells[0].offsetWidth;
      } else {
        obj_marquee.scrollLeft++;
      }
      break;
    case "right":
      if(obj_marquee.scrollLeft <= 0) {
        obj_marquee.scrollLeft += obj_marquee.firstChild.rows[0].cells[0].offsetWidth;
      } else {
        obj_marquee.scrollLeft--;
      }
      break;
    default:
      break;
  }
  return;
}

function marquee_doit() {
  var direction = "";
  direction = obj_marquee.getAttribute("direction");
  if(direction != null) marquee_show(direction);
  direction = obj_marquee.getAttribute("direction2");
  if(direction != null) marquee_show(direction);
  return;
}

marquee_init();
repeat = setInterval("marquee_doit()",marquee_spd);

marquee.onmouseover = function() {clearInterval(repeat);}
marquee.onmouseout = function() {repeat=setInterval("marquee_doit()",marquee_spd);}错误: 无法读取页脚文件。