输入框神秘消失

输入框神秘消失

下面框中为脚本显示区

脚本说明：
把如下代码加入<body>区域中:
<SCRIPT>
if (document.layers) {
  document.writeln ('<STYLE>');
  document.writeln ('  .changeable { position: relative; }');
  document.writeln ('<\/STYLE>');
}
</SCRIPT>

<SCRIPT>

function setElement (id, html) {
  if (document.layers) {
    var l = document[id];
    if (!l.overLayer) {
      l.overLayer = new Layer(l.clip.width);
      l.overLayer.left = l.pageX;
      l.overLayer.top  = l.pageY;
      l.visibility = 'hide';
      l.overLayer.visibility = 'show';
    }
    l.overLayer.document.open();
    l.overLayer.document.write(html);
    l.overLayer.document.close();
  }
  else if (document.all) {
    document.all[id].innerHTML = html;
  }
}
function changeNow() {
var user = document.aForm.user.value
document.aForm.aField.value = "Welcome "+user+"";
setElement ('someParagraph', document.aForm.aField.value);
}
var nw = "'";
document.write('<FORM NAME="aForm">');
document.write('<INPUT TYPE="hidden" NAME="aField" VALUE="">');
document.write('<SPAN ID="someParagraph" CLASS="changeable">');
document.write('<input type=text name=user size=5> <INPUT TYPE="button" VALUE="ok" ONCLICK="changeNow();">');
document.write('</SPAN></form>');
</SCRIPT>